Search Results

Search found 22 results on 1 pages for 'paintevent'.

Page 1/1 | 1 

  • How to force calling of QWidget::paintEvent() when its hovered by other window?

    - by Pie_Jesu
    Hi there. I have occured a problem: I'm writing a widget, which displays current date's day number. It's like a button, but it's not derived from QPushButton class. Just from QWidget. So I reimplemented enterEvent(), leaveEvent(), mousePressEvent(), mouseReleaseEvent(). I call update() inside these methods and widget has realistic button behavior (paintEvent() is reimplemented too). But when I change system date and hover that widget with other window, my widget doesn't calls paintEvent() and displays old date. Only when I place mouse over it, widget repaints it's contents. I guess there is an option, which paints old contents on hover event to avoid unnecessary paint events. But I need to disable it. Tried to set many attributes (Qt::WidgetAttribute enum). But it doesn't helps. Please, help me (and sorry for my bad english).

    Read the article

  • Printing complex widgets in Qt

    - by Jens
    I have a complex widget with tons of different subwidgets, e.g. subclasses of QLabel. I want to print this widget, but obviously I do not want to print the background, I want to print with differing text colors or have the style of frames slightly modified. As I do not really want to iterate through all subwidgets with a special "print" function, which I would need to attach to all widgets (how to add "print" to a QLabel?), I would like to use paintEvent. If I have a hierarchy MyWidget - derived from - some QWidget, I would like to insert a sublayer MyWidget - MyPrintWidget - some QWidget, where myPrintWidget::paintEvent would check, if the current print is going to the screen (thus call QWidget::paintEvent), else if we are printing to the printer, call some function MyPrintWidget::drawWidget instead. Is this the right way to print-enable a widget? How can I figure out in paintEvent, that I'm printing to a printer instead of the screen? Is there a good example of printing complex widgets?

    Read the article

  • how to update newly exposed area of a scrolled widget

    - by yan bellavance
    I have setAttribute(Qt::WA_OpaquePaintEvent,true) on a widget. From a mouseMoveEvent, I scroll the widget. Now what I need to do is to update the newly exposed area, but it seems that doing this from the paintevent function create an artifact because there is a delay created when the user keeps scrolling. In other words, the widget seems to have scrolled again between the call to scrool and the call or end of paintevent. For example, while the paint event is trying to draw the desired area, the widget is still scrolling

    Read the article

  • Insane CPU usage in QT 5.0

    - by GravityScore
    I'm having trouble using the QT framework, particularly with the paintEvent of QWidget. I have a QWidget set up, and am overriding the paintEvent of it. I need to render a bunch of rectangles (grid system), 51 by 19, leading to 969 rectangles being drawn. This is done in a for loop. Then I also need to draw an image on each on of these grids. The QWidget is added to a QMainWindow, which is shown. This works nicely, but it's using up 47% of CPU per window open! And I want to allow the user to open multiple windows like this, likey having 3-4 open at a time, which puts the CPU close to 150%. Why does this happen? Here is the paintEvent contents. The JNI calls don't cause the CPU usage, commenting them out doesn't lower it, but commenting out the p.fillRect and Renderer::renderString (which draws the image) lowers the CPU to about 5%. // Background QPainter p(this); p.fillRect(0, 0, this->width(), this->height(), QBrush(QColor(0, 0, 0))); // Lines for (int y = 0; y < Global::terminalHeight; y++) { // Line and color method ID jmethodID lineid = Manager::jenv->GetMethodID(this->javaClass, "getLine", "(I)Ljava/lang/String;"); error(); jmethodID colorid = Manager::jenv->GetMethodID(this->javaClass, "getColorLine", "(I)Ljava/lang/String;"); error(); // Values jstring jl = (jstring) Manager::jenv->CallObjectMethod(this->javaObject, lineid, jint(y)); error(); jstring cjl = (jstring) Manager::jenv->CallObjectMethod(this->javaObject, colorid, jint(y)); error(); // Convert to C values const char *l = Manager::jenv->GetStringUTFChars(jl, 0); const char *cl = Manager::jenv->GetStringUTFChars(cjl, 0); QString line = QString(l); QString color = QString(cl); // Render line for (int x = 0; x < Global::terminalWidth; x++) { QColor bg = Renderer::colorForHex(color.mid(x + color.length() / 2, 1)); // Cell location on widget int cellx = x * Global::cellWidth + Global::xoffset; int celly = y * Global::cellHeight + Global::yoffset; // Background p.fillRect(cellx, celly, Global::cellWidth, Global::cellHeight, QBrush(bg)); // String // Renders the image to the grid Renderer::renderString(p, tc, text, cellx, celly); } // Release Manager::jenv->ReleaseStringUTFChars(jl, l); Manager::jenv->ReleaseStringUTFChars(cjl, cl); }

    Read the article

  • How to update a QPixmap in a QGraphicsView with PyQt

    - by pops
    I am trying to paint on a QPixmap inside a QGraphicsView. The painting works fine, but the QGraphicsView doesn't update it. Here is some working code: #!/usr/bin/env python from PyQt4 import QtCore from PyQt4 import QtGui class Canvas(QtGui.QPixmap): """ Canvas for drawing""" def __init__(self, parent=None): QtGui.QPixmap.__init__(self, 64, 64) self.parent = parent self.imH = 64 self.imW = 64 self.fill(QtGui.QColor(0, 255, 255)) self.color = QtGui.QColor(0, 0, 0) def paintEvent(self, point=False): if point: p = QtGui.QPainter(self) p.setPen(QtGui.QPen(self.color, 1, QtCore.Qt.SolidLine)) p.drawPoints(point) def clic(self, mouseX, mouseY): self.paintEvent(QtCore.QPoint(mouseX, mouseY)) class GraphWidget(QtGui.QGraphicsView): """ Display, zoom, pan...""" def __init__(self): QtGui.QGraphicsView.__init__(self) self.im = Canvas(self) self.imH = self.im.height() self.imW = self.im.width() self.zoomN = 1 self.scene = QtGui.QGraphicsScene(self) self.scene.setItemIndexMethod(QtGui.QGraphicsScene.NoIndex) self.scene.setSceneRect(0, 0, self.imW, self.imH) self.scene.addPixmap(self.im) self.setScene(self.scene) self.setTransformationAnchor(QtGui.QGraphicsView.AnchorUnderMouse) self.setResizeAnchor(QtGui.QGraphicsView.AnchorViewCenter) self.setMinimumSize(400, 400) self.setWindowTitle("pix") def mousePressEvent(self, event): if event.buttons() == QtCore.Qt.LeftButton: pos = self.mapToScene(event.pos()) self.im.clic(pos.x(), pos.y()) #~ self.scene.update(0,0,64,64) #~ self.updateScene([QtCore.QRectF(0,0,64,64)]) self.scene.addPixmap(self.im) print('items') print(self.scene.items()) else: return QtGui.QGraphicsView.mousePressEvent(self, event) def wheelEvent(self, event): if event.delta() > 0: self.scaleView(2) elif event.delta() < 0: self.scaleView(0.5) def scaleView(self, factor): n = self.zoomN * factor if n < 1 or n > 16: return self.zoomN = n self.scale(factor, factor) if __name__ == '__main__': import sys app = QtGui.QApplication(sys.argv) widget = GraphWidget() widget.show() sys.exit(app.exec_()) The mousePressEvent does some painting on the QPixmap. But the only solution I have found to update the display is to make a new instance (which is not a good solution). How do I just update it?

    Read the article

  • QT: custom widget in QScrollArea

    - by slimscsi
    I am attempting to create a custom widget. My Widget renders itself unless it is inside a scroll area. The code below works. If I change the if(0) to an if(1) inside the MainWindow constructor, it will not render the "Hello World" string. I assume that I must (re)implement some additional methods, but so far I have not been able to find the correct ones with trial and error. // hellowidget.h #ifndef HELLOWIDGET_H #define HELLOWIDGET_H #include <QtGui> class HelloWidget : public QWidget { Q_OBJECT public: HelloWidget(QWidget *parent = 0); void paintEvent(QPaintEvent *event); }; #endif // HELLOWIDGET_H // hellowidget.cpp #include "hellowidget.h" HelloWidget::HelloWidget(QWidget *parent) : QWidget(parent) { } void HelloWidget::paintEvent(QPaintEvent *event) { QPainter painter(this); painter.drawText(rect(), Qt::AlignCenter, "Hello World"); } // mainwindow.h #ifndef MAINWINDOW_H #define MAINWINDOW_H #include <QtGui> class MainWindow : public QMainWindow { Q_OBJECT public: MainWindow(QWidget *parent = 0); ~MainWindow(); private: }; #endif // MAINWINDOW_H // mainwindow.cpp #include "mainwindow.h" #include "hellowidget.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) { HelloWidget *hello = new HelloWidget; QWidget *central = hello; if( 0 ) { QScrollArea *scroll = new QScrollArea ; scroll->setWidget(hello); central = scroll; } setCentralWidget( central ); } MainWindow::~MainWindow() { } // main.cpp #include <QtGui/QApplication> #include "mainwindow.h" int main(int argc, char *argv[]) { QApplication a(argc, argv); MainWindow w; w.show(); return a.exec(); }

    Read the article

  • How to get the application font color in Qt

    - by Solitaire
    Hi, I want to put some text on my UI, I am drawing the text in paint event of a widget using painter.. Here is the sample code, which shows how I am drawing the text.. QWidget::paintEvent(painter); QPainter paint(this); paint.drawText(QPoint(10,30),"Duplex"); but, the text color is looks like the default theme color, how to set the application font color to the text in paint event.. Thanks

    Read the article

  • optimizing widget painting.

    - by yan bellavance
    I am painting a widget and I want to optimize the process. Basically i will be sliding the image in the x direction and I only want to fill the newly exposed area. Is there a way to translate the pixels of a widget without calling update or using paintevent? I know of pixmaps and such but I am wondering If I can for example draw a pixmap once and then translate what I have drawn without having to paint anything else or draw pixmaps anymore.

    Read the article

  • Qt - reloading widget contents

    - by bullettime
    I'm trying to modify the fridge magnets example by adding a button that will reload the widget where the draggable labels are drawn, reflecting any changes made to the text file it reads. I defined another class that would contain the button and the DragWidget object, so there would be an instance of this class instead of DragWidget in main(): class wrapWidget: public QWidget { public: wrapWidget(); }; wrapWidget::wrapWidget() { QGridLayout *gridlayout = new QGridLayout(); DragWidget *w = new DragWidget(); QPushButton *b = new QPushButton("refresh"); gridlayout ->addWidget(w,0,0); gridlayout ->addWidget(b,1,0); setLayout(gridlayout ); connect(b,SIGNAL(clicked()),w,SLOT(draw())); } The call to connect is where I'm trying to do the refresh thing. In the original fridge magnets example, all the label drawing code was inside the constructor of the DragWidget class. I moved that code to a public method that I named 'draw()', and called this method from the constructor instead. Here's DragWidget definition and implementation: #include <QWidget> QT_BEGIN_NAMESPACE class QDragEnterEvent; class QDropEvent; QT_END_NAMESPACE class DragWidget : public QWidget { public: DragWidget(QWidget *parent = 0); public slots: void draw(); protected: void dragEnterEvent(QDragEnterEvent *event); void dragMoveEvent(QDragMoveEvent *event); void dropEvent(QDropEvent *event); void mousePressEvent(QMouseEvent *event); void paintEvent(QPaintEvent *event); }; DragWidget::DragWidget(QWidget *parent) : QWidget(parent) { draw(); QPalette newPalette = palette(); newPalette.setColor(QPalette::Window, Qt::white); setPalette(newPalette); setMinimumSize(400, 100);//qMax(200, y)); setWindowTitle(tr("Fridge Magnets")); setAcceptDrops(true); } void DragWidget::draw(){ QFile dictionaryFile(":/dictionary/words.txt"); dictionaryFile.open(QFile::ReadOnly); QTextStream inputStream(&dictionaryFile); int x = 5; int y = 5; while (!inputStream.atEnd()) { QString word; inputStream >> word; if (!word.isEmpty()) { DragLabel *wordLabel = new DragLabel(word, this); wordLabel->move(x, y); wordLabel->show(); wordLabel->setAttribute(Qt::WA_DeleteOnClose); x += wordLabel->width() + 2; if (x >= 245) { x = 5; y += wordLabel->height() + 2; } } } } I thought that maybe calling draw() as a slot would be enough to reload the labels, but it didn't work. Putting the draw() call inside the widget's overriden paintEvent() instead of the constructor didn't work out as well, the program would end up in an infinite loop. What I did was obviously not the right way of doing it, so what should I be doing instead?

    Read the article

  • QT: Scroll widget that renders directly to the DC

    - by shoosh
    I'm trying to create a widget which paints directly to the windows Device Context by calling getDC() and painting an HBITMAP to it. The widget I'm painting resides inside a scroll widget. I've implemented the paintEvent() and it does seem to paint but immediatly after painting the widget gets painted over again with a blank gray color. I've tried setting WA_PaintOnScreen and Qt::WA_NoSystemBackground but none of those help. In theory this should be possible since this is basically how the GLWidget works. What am I missing?

    Read the article

  • ChaiScript troubles

    - by Ockonal
    Hello guys, I'm using script language ChaiScript with c++ and Qt. I've defined such function: void ChaiPainter::drawRectangle(QPainter *painter, int x, int y, int height, int width) { painter.drawRect(x, y, width, height); } And in application paint-event: void MainWindow::paintEvent(QPaintEvent *event) { QPainter painter(this); chaiPainter->mChai.add(chaiscript::var(&painter), "painter"); chaiPainter->mChai.add(chaiscript::fun(&ChaiPainter::drawRectangle), "drawRect"); chaiPainter->mChai("drawRect(painter, 5, 5, 100, 100)"); } The error is: 'chaiscript::Eval_Error' what(): Error: "No matching function to dispatch to with function 'drawRect'" during evaluation at (1, 1) What I do wrong?

    Read the article

  • QT drawing without erasing widget

    - by faya
    Hello, If I have a derived object of QWidget class and on slot function in it I have an update(). here is some pseudocode: *.h slot: updateNow(); *.cpp constructor() { setPalllete(QPallete(QColor(250,250,200))); setAUtoFillBackground(true); } updateNow() { update(); } paintEvent() { QPainter painter(this); painter.drawRect(1,2,3,4); } So how should I don't get erased my pallete after update() call? P.S. - Sorry for my English and only pseudocode.

    Read the article

  • QT: QPainter + GDI in the same widget?

    - by shoosh
    I'm trying to use the method described here to use a QPainter and GDI calls on the same widget. Unfortunately this tutorial seem to have been written on an earlier version of QT and now it does not work. I set the WA_PaintOnScreen flag and reimplement paintEngine() to return NULL. Then on the paintEvent() I create a QPainter, use it and then use some GDI calls to paint a bitmap. The GDI calls work fine but the QPainter does nothing. I get the following error on the console: QPainter::begin: Paint device returned engine == 0, type: 1 Is this simply not supported anymore? how can I do it? I've also tried creating an additional widget on top of the GDI-painting widget but that didn't go well as well since the top widget appears black and blocks the GDI widget.

    Read the article

  • QT- QImage and multi-threading problem.

    - by umanga
    Greetings all, Please refer to image at : http://i48.tinypic.com/316qb78.jpg We are developing an application to extract cell edges from MRC images from electron microscope. MRC file format stores volumetric pixel data (http://en.wikipedia.org/wiki/Voxel) and we simply use 3D char array(char***) to load and store data (gray scale values) from a MRC file. As shown in the image,there are 3 viewers to display XY,YZ and ZX planes respectively. Scrollbars on the top of the viewers use to change the image slice along an axis. Here is the steps we do when user changes the scrollbar position. 1) get the new scrollbar value.(this is the selected slice) 2) for the relavant plane (YZ,XY or ZX), generate (char* slice;) array for the selected slice by reading 3D char array (char***) 3) Create a new QImage* (Format_RGB888) and set pixel values by reading 'slice' (using img-setPixel(x,y,c);) 4) This new QImage* is painted in the paintEvent() method. We are going to execute "edge-detection" process in a seperate thread since it is an intensive process.During this process we need to draw detected curve (set of pixels) on top of above QImage*.(as a layer).This means we need to call drawPoint() methods outside the QT thread. Is it the best wayto use QImage for this case? What is the best way to execute QT drawing methods from another thread? thanks in advance,

    Read the article

  • WYSIWYG with Qt - font size woes

    - by Rob
    I am creating a custom Qt widget that mimics an A4 printed page and am having problems getting fonts to render at the correct size. My widget uses QPainter::setViewport and QPainter::setWindow to mimic the A4 page, using units of 10ths of a millimetre which enables me to draw easily. However, attempting to create a font at a specific point size doesn't seem to work and using QFont:setPixelSize isn't accurate. Here is some code: View::View(QWidget *parent) : QWidget(parent), printer(new QPrinter) { printer->setPaperSize(QPrinter::A4); printer->setFullPage(true); } void View::paintEvent(QPaintEvent*) { QPainter painter(this); painter.setWindow(0, 0, 2100, 2970); painter.setViewport(0, 0, printer->width(), printer->height()); // Draw a rect at x = 1cm, y = 1cm, 6cm wide and 1 inch high painter.drawRect(100, 100, 600, 254); // Create a 72pt (1 inch) high font QFont font("Arial"); font.setPixelSize(254); painter.setFont(font); // Draw in the same box // The font is too large painter.drawText(QRect(100, 100, 600, 254), tr("Wg\u0102")); // Ack - the actual font size reported by the metrics is 283 pixels! const QFontMetrics fontMetrics = painter.fontMetrics(); qDebug() << "Font height = " << fontMetrics.height(); } So I'm asking for a 254 high font (1 inch, 72 pts) and it's too big and sure enough when I query for the font height via QFontMetrics it is 283 high. Does anyone else know how to use font sizes in points when using custom mapping modes like this? It must be possible. Note that I cannot see how to convert between logical/device points either (i.e. the Win32 DPtoLP/LPtoDP equivalents.)

    Read the article

  • Segmentation fault in Qt application framework

    - by yan bellavance
    this generates a segmentation fault becuase of "QColor colorMap[9]";. If I remove colorMap the segmentation fault goes away. If I put it back. It comes back. If I do a clean all then build all, it goes away. If I increase its arraysize it comes back. On the other hand if I reduce it it doesnt come back. I tired adding this array to another project and What could be happening. I am really curious to know. I have removed everything else in that class. This widget subclassed is used to promote a widget in a QMainWindow. class LevelIndicator : public QWidget { public: LevelIndicator(QWidget * parent); void paintEvent(QPaintEvent * event ); float percent; QColor colorMap[9]; int NUM_GRADS; }; the error happens inside ui_mainwindow.h at one of these lines: hpaFwdPwrLvl->setObjectName(QString::fromUtf8("hpaFwdPwrLvl")); verticalLayout->addWidget(hpaFwdPwrLvl); I know i am not providing much but I will give alink to the app. Im trying to see if anyone has a quick answer for this.

    Read the article

  • What is the purpose of the QAbstractButton::checkStateSet() method?

    - by darkadept
    I'm writing my own 4 state button and I'm not quite sure what to put in the checkStateSet() method, if anything. Here is what I've got so far: SyncDirectionButton::SyncDirectionButton(QWidget *parent) : QAbstractButton(parent) { setCheckable(true); setToolTip(tr("Click to change the sync direction")); _state = NoSync; } void SyncDirectionButton::paintEvent(QPaintEvent *e) { static QPixmapCache::Key noneKey; static QPixmapCache::Key bothKey; static QPixmapCache::Key leftKey; static QPixmapCache::Key rightKey; QPainter p(this); QPixmap pix; if (checkState() == SyncLeft) { if (!QPixmapCache::find(leftKey, &pix)) { pix.load(":/icons/sync-left.png"); leftKey = QPixmapCache::insert(pix); } } else if (checkState() == SyncBoth) { if (!QPixmapCache::find(rightKey, &pix)) { pix.load(":/icons/sync-right.png"); rightKey = QPixmapCache::insert(pix); } } else if (checkState() == SyncRight) { if (!QPixmapCache::find(bothKey, &pix)) { pix.load(":/icons/sync-both.png"); bothKey = QPixmapCache::insert(pix); } } else if (checkState() == NoSync) { if (!QPixmapCache::find(noneKey, &pix)) { pix.load(":/icons/application-exit.png"); noneKey = QPixmapCache::insert(pix); } } p.drawPixmap(0,0,pix); } SyncDirectionButton::DirectionState SyncDirectionButton::checkState() const { return _state; } void SyncDirectionButton::setCheckState(DirectionState state) { setChecked(state != NoSync); if (state != _state) { _state = state; } } QSize SyncDirectionButton::sizeHint() const { return QSize(180,90); } void SyncDirectionButton::checkStateSet() { } void SyncDirectionButton::nextCheckState() { setCheckState((DirectionState)((checkState()+1)%4)); }

    Read the article

  • Segmentation fault in Qt Designer 4.6 with custom widget

    - by chedi
    Hi, I had a segmentation fault when using my new Qt Widget with Qt Designer 4.6. The problem arise when trying to preview the new widget. when using gdb I found that the problem is in qdesigner_internal::WidgetFactory::applyStyleToTopLevel: Program received signal SIGSEGV, Segmentation fault. qdesigner_internal::WidgetFactory::applyStyleToTopLevel (style=0x0, widget=0x1829df0) at /var/tmp/qt-x11-src-4.6.0/tools/designer/src/lib/shared/widgetfactory.cpp:777 777 /var/tmp/qt-x11-src-4.6.0/tools/designer/src/lib/shared/widgetfactory.cpp: No such file or directory. in /var/tmp/qt-x11-src-4.6.0/tools/designer/src/lib/shared/widgetfactory.cpp (gdb) bt #0 qdesigner_internal::WidgetFactory::applyStyleToTopLevel (style=0x0, widget=0x1829df0) at /var/tmp/qt-x11-src-4.6.0/tools/designer/src/lib/shared/widgetfactory.cpp:777 #1 0x00007ffff7475bed in qdesigner_internal::QDesignerFormBuilder::createPreview (fw=, styleName=..., appStyleSheet=..., deviceProfile=, scriptErrors= 0x7fffffffbee0, errorMessage=0x7fffffffc3f0) at /var/tmp/qt-x11-src-4.6.0/tools/designer/src/lib/shared/qdesigner_formbuilder.cpp:404 #2 0x00007ffff7476773 in qdesigner_internal::QDesignerFormBuilder::createPreview (fw=0x0, styleName=..., appStyleSheet=..., deviceProfile=..., errorMessage=0x0) at /var/tmp/qt-x11-src-4.6.0/tools/designer/src/lib/shared/qdesigner_formbuilder.cpp:439 #3 0x00007ffff7532b27 in qdesigner_internal::PreviewManager::createPreview (this=0x837f20, fw=0x1879200, pc=..., deviceProfileIndex=-1, errorMessage=0x7fffffffc3f0, initialZoom=-1) at /var/tmp/qt-x11-src-4.6.0/tools/designer/src/lib/shared/previewmanager.cpp:686 #4 0x00007ffff75343cf in qdesigner_internal::PreviewManager::showPreview (this=0x837f20, fw=0x1879200, pc=..., deviceProfileIndex=-1, errorMessage=0x7fffffffc3f0) at /var/tmp/qt-x11-src-4.6.0/tools/designer/src/lib/shared/previewmanager.cpp:760 #5 0x00007ffff753472f in qdesigner_internal::PreviewManager::showPreview (this=0x837f20, fw=0x1879200, style=..., deviceProfileIndex=-1, errorMessage=0x7fffffffc3f0) at /var/tmp/qt-x11-src-4.6.0/tools/designer/src/lib/shared/previewmanager.cpp:659 because a null pointer was passed there: void WidgetFactory::applyStyleToTopLevel(QStyle *style, QWidget *widget) { const QPalette standardPalette = style-standardPalette(); if (widget-style() == style && widget-palette() == standardPalette) return; //.... } I'm new in Qt and this is my first custom widget. does anybody have a clue for solving this. here is my widget code MBICInput::MBICInput(QWidget *parent) : QStackedWidget(parent){ displayPage = new QWidget(); displayPage-setObjectName(QString::fromUtf8("displayPage")); inputLB = new QLabel(displayPage); inputLB-setObjectName(QString::fromUtf8("inputLabel")); inputLB-setCursor(QCursor(Qt::PointingHandCursor)); addWidget(displayPage); EditPage = new QWidget(); EditPage-setProperty("EditInputLine", QVariant(true)); EditPage-setObjectName(QString::fromUtf8("EditPage")); inputInput = new QLineEdit(EditPage); inputInput-setGeometry(QRect(5, 10, 231, 25)); inputInput-setObjectName(QString::fromUtf8("input")); addWidget(EditPage); _animation = new QString(""); _message = new QString("Message"); _validator = new QRegExpValidator(QRegExp("[a-zA-Z]+"), this); } MBICInput::~MBICInput() { } QValidator::State MBICInput::validate(QString &text, int &pos) const{ return _validator-validate(text, pos); } void MBICInput::paintEvent(QPaintEvent *) { QPainter painter(this); painter.setRenderHint(QPainter::Antialiasing); } QSize MBICInput::minimumSizeHint() const{ return QSize(200, 40); } QSize MBICInput::sizeHint() const{ return QSize(200, 40); } void MBICInput::setAnimation(const QString &animation){ *_animation = animation; update(); } QString MBICInput::animation() const{ return *_animation; } void MBICInput::setMessage(const QString &message){ *_message = message; update(); } QString MBICInput::message() const{ return *_message; } void MBICInput::mousePressEvent(QMouseEvent *event){ if(currentIndex()==0){ setCurrentIndex(1); }else{ setCurrentIndex(0); } update(); }

    Read the article

  • how to run this qt script? (newbie question)

    - by GB_J
    I have a qt script(barchart.qs) that creates a graph for me. I don't know how i can incorporate(ie show the graph) in my qt mainwindow. Can some one please help me look at the code and what its outputs are? I tried engine.evaluate, but i do not know what is the QScriptValue i'm getting in return. Thanks sooo much. This is the script: BarChart.prototype = new QWidget; BarChart.prototype.suffix = ""; function BarChart(parent) { QWidget.call(this, parent); } // find the maximum value and widest (pixel-wise) label and suffix BarChart.prototype.showEvent = function(event) { var fm = new QFontMetrics(this); this.margin = 20; this.titleHeight = fm.height(); this.barHeight = 1.5 * fm.height(); this.barSpacing = 0.6 * fm.height(); this.maxValue = this.suffixWidth = this.labelWidth = 0; var count = 0; for (d in this.data) { this.labelWidth = Math.max(this.labelWidth, fm.width(d)); this.maxValue = Math.max(this.maxValue, this.data[d]); this.suffixWidth = Math.max(this.suffixWidth, fm.width(String(this.data[d]) + " " + this.suffix)); count++; } this.startHue = 15; this.hueDelta = 360 / count; this.size = new QSize(640, this.titleHeight + 2 * this.margin + (this.barHeight + this.barSpacing) * count); } BarChart.prototype.paintEvent = function(event) { var p = new QPainter; p.begin(this); // background and title p.fillRect(this.rect, new QBrush(new QColor(255, 255, 255))); p.drawText(0, 0, this.width, this.margin + this.titleHeight, Qt.AlignCenter, this.windowTitle, 0); var ofs = this.labelWidth + this.margin; var ww = this.width - this.suffixWidth - ofs - 2 * this.margin; var hue = this.startHue; var y = 0; p.translate(this.margin, this.titleHeight + 1.5 * this.margin); for (d in this.data) { // label on the left side p.setPen(new QColor(Qt.black)); p.drawText(0, y, this.labelWidth, this.barHeight, Qt.AlignVCenter + Qt.AlignRight, d, 0); // the colored bar var gradient = new QLinearGradient(new QPoint(ofs, y), new QPoint(ofs, y + this.barHeight)); gradient.setColorAt(0, QColor.fromHsv(hue, 255, 240)); gradient.setColorAt(1, QColor.fromHsv(hue, 255, 92)); p.setBrush(new QBrush(gradient)); p.setPen(new QColor(96, 96, 96)); var bw = this.data[d] * ww / this.maxValue; p.drawRect(ofs, y, bw, this.barHeight); // extra text at the end of the bar var text = new String(this.data[d] + " " + this.suffix); p.setPen(new QColor(Qt.black)); p.drawText(ofs + bw + this.margin/2, y, this.suffixWidth, this.barHeight, Qt.AlignVCenter + Qt.AlignLeft, text, 0); // for the next bar y += (this.barHeight + this.barSpacing); hue += this.hueDelta; if (hue >= 360) hue -= 360; } p.end(); } BarChart.prototype.wheelEvent = function(event) { this.startHue += event.delta() / 8 / 5; if (this.startHue = 360) this.startHue -= 360; if (this.startHue < 0) this.startHue += 360; this.update(); event.ignore(); } BarChart.prototype.mousePressEvent = function(event) { var fname = QFileDialog.getSaveFileName(this, "Save", ".", "*.png", 0, 0); if (fname.length > 0) { var img = new QImage(this.size, QImage.Format_ARGB32_Premultiplied); this.render(img); img.save(new QFile(fname)); } } var chart = new BarChart; chart.windowTitle = "Monthly"; chart.suffix = "reports"; chart.data = { "September" : 45, "October" : 60, "November" : 56, "December" : 0 }; chart.show(); QCoreApplication.exec();

    Read the article

  • Qt QAbstractButton setDown interferes with grabMouse

    - by edA-qa mort-ora-y
    I have some weird behaviour in Qt that seems like a defect. I'd like to know if anybody has a good workaround. I have a popup widget that contains many buttons in it. The user activates the popup by pressing the mouse button down. The popup widget calls grabMouse when shown. It gets all the mouse events. As it rolls over a button it calls setDown(true) on the button. Now however, when the mouse button is released the popup widget does not get the mouseReleaseEvent, that goes to the button. That is, calling setDown(true) on a button causes the button to steal mouse events, bypassing the grabMouse in the popup widget. I've looked at the source code for setDown but I can't see anything there that would do it directly. I also notice however that sometimes a button gets a hover event, sometimes not. I would assume it would never get those events when the mouse is grabbed. //g++ -o grab_lost grab_lost.cpp -lQtCore -lQtGui -I /usr/include/qt4/ -I /usr/include/qt4/QtCore -I /usr/include/qt4/QtGui /** Demonstrates the defect of losing the mouse. Run the program and: 1. Press mouse anywhere 2. release in purple block (not on X) 3. Release message written (GrabLost receives the mouseReleaseEvent) For defect: 1. Pree mouse anywhere 2. Release inside the X button 3. button is clicked, no release message (GrabLost does not get the mouseReleaseEvent) */ #include <QWidget> #include <QPushButton> #include <QApplication> #include <QMouseEvent> #include <QPainter> class GrabLost : public QWidget { QPushButton * btn; public: GrabLost( QWidget * parent = 0) : QWidget( parent, Qt::Popup ) { btn = new QPushButton( "X", this ); setMouseTracking( true ); } protected: void showEvent( QShowEvent * ev ) { QWidget::showEvent( ev ); grabMouse(); } void closeEvent( QCloseEvent * ev ) { releaseMouse(); QWidget::closeEvent( ev ); } void hideEvent( QHideEvent * ev ) { releaseMouse(); QWidget::hideEvent( ev ); } void mouseReleaseEvent( QMouseEvent * ev ) { qDebug( "mouseRelease" ); close(); } void mouseMoveEvent( QMouseEvent * ev ) { QWidget * w = childAt( ev->pos() ); bool ours = dynamic_cast<QPushButton*>( w ) == btn; btn->setDown( ours ); } void paintEvent( QPaintEvent * ev ) { //just to show where the widget is QPainter pt( this ); pt.setPen( QColor( 0,0,0 ) ); pt.setBrush( QColor( 128,0,128) ); pt.drawRect( 0, 0, size().width(), size().height() ); } }; class GrabMe : public QWidget { protected: void mousePressEvent( QMouseEvent * ev ) { GrabLost * gl = new GrabLost(); gl->resize( 100, 100 ); QPoint at( mapToGlobal( ev->pos() ) ); gl->move( at.x() - 50, at.y() - 50 ); gl->show(); } }; int main( int argc, char** argv ) { QApplication app( argc, argv ); GrabMe * gm = new GrabMe(); gm->move( 100, 100 ); gm->resize( 300, 300 ); gm->show(); app.exec(); return 0; }

    Read the article

  • calculix data visualizor using QT

    - by Ann
    include "final1.h" include "ui_final1.h" include include include ifndef GL_MULTISAMPLE define GL_MULTISAMPLE 0x809D endif define numred 100 define numgrn 10 define numblu 6 final1::final1(QWidget *parent) : QGLWidget(parent) { setFormat(QGLFormat(QGL::SampleBuffers)); rotationX = -38.0; rotationY = -58.0; rotationZ = 0.0; scaling = .05; // glPolygonMode(GL_FRONT_AND_BACK,GL_FILL); //createGradient(); createGLObject(); } final1::~final1() { makeCurrent(); glDeleteLists(glObject, 1); } void final1::paintEvent(QPaintEvent * /* event */) { QPainter painter(this); draw(); } void final1::mousePressEvent(QMouseEvent *event) { lastPos = event-pos(); } void final1::mouseMoveEvent(QMouseEvent *event) { GLfloat dx = GLfloat(event-x() - lastPos.x()) / width(); GLfloat dy = GLfloat(event-y() - lastPos.y()) / height(); if (event->buttons() & Qt::LeftButton) { rotationX += 180 * dy; rotationY += 180 * dx; update(); } else if (event->buttons() & Qt::RightButton) { rotationX += 180 * dy; rotationZ += 180 * dx; update(); } lastPos = event->pos(); } void final1::createGLObject() { makeCurrent(); GLfloat f1[150],f2[150],f3[150],length=0; qreal size=2; int k=1,a,b,c,d,e,f,g,h,element_node_no=0; GLfloat x,y,z; QString str1,str2,str3,str4,str5,str6,str7,str8; int red,green,blue,index=1,displacement; int LUT[1000][3]; for(red=100;red glShadeModel(GL_SMOOTH); glObject = glGenLists(1); glNewList(glObject, GL_COMPILE); // qglColor(QColor(255, 239, 191)); glLineWidth(1.0); QLinearGradient linearGradient(0, 0, 100, 100); linearGradient.setColorAt(0.0, Qt::red); linearGradient.setColorAt(0.2, Qt::green); linearGradient.setColorAt(1.0, Qt::black); //renderArea->setBrush(linearGradient); //glColor3f(1,0,0);pow((f1[e]-f1[a]),2) QFile file("/home/41407/input1.txt"); if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) return; QTextStream in(&file); while (!in.atEnd()) { QString line = in.readLine(); if(k<=125) { str1= line.section(',', 1, 1); str2=line.section(',', 2, 2); str3=line.section(',', 3, 3); x=str1.toFloat(); y=str2.toFloat(); z=str3.toFloat(); f1[k]=x; f2[k]=y; f3[k]=z; /* glBegin(GL_TRIANGLES); // glColor3f(LUT[k][0],LUT[k][1],LUT[k][2]); //QColorAt();//setPointSize(size); glVertex3f(x,y,z); glEnd();*/ } else if(k>125) { element_node_no=0; qCount(line.begin(),line.end(),',',element_node_no); // printf("\n%d",element_node_no); str1= line.section(',', 1, 1); str2=line.section(',', 2, 2); str3=line.section(',', 3, 3); str4= line.section(',', 4, 4); str5=line.section(',', 5, 5); str6=line.section(',', 6, 6); str7= line.section(',', 7, 7); str8=line.section(',', 8, 8); a=str1.toInt(); b=str2.toInt(); c=str3.toInt(); d=str4.toInt(); e=str5.toInt(); f=str6.toInt(); g=str7.toInt(); h=str8.toInt(); glBegin(GL_POLYGON); glPolygonMode(GL_FRONT_AND_BACK,GL_FILL); //brush.setColor(Qt::black);//setColor(QColor::black()); glColor3f(LUT[k][0],LUT[k][1],LUT[k++][2]); // pmp.setBrush(gradient); glVertex3f(f1[a],f2[a] ,f3[a]); glColor3f(LUT[k][0],LUT[k][1],LUT[k++][2]); glVertex3f(f1[b],f2[b] ,f3[b]); glColor3f(LUT[k][0],LUT[k][1],LUT[k++][2]); glVertex3f(f1[c],f2[c] ,f3[c]); glColor3f(LUT[k][0],LUT[k][1],LUT[k++][2]); glVertex3f(f1[d],f2[d] ,f3[d]); glColor3f(LUT[k][0],LUT[k][1],LUT[k++][2]); glVertex3f(f1[a],f2[a] ,f3[a]); glColor3f(LUT[k][0],LUT[k][1],LUT[k++][2]); //glEnd(); //glBegin(GL_LINE_LOOP); glVertex3f(f1[e],f2[e] ,f3[e]); glColor3f(LUT[k][0],LUT[k][1],LUT[k++][2]); glVertex3f(f1[f],f2[f] ,f3[f]); glColor3f(LUT[k][0],LUT[k][1],LUT[k++][2]); glVertex3f(f1[g],f2[g], f3[g]); glColor3f(LUT[k][0],LUT[k][1],LUT[k++][2]); glVertex3f(f1[h],f2[h], f3[h]); glColor3f(LUT[k][0],LUT[k][1],LUT[k++][2]); glVertex3f(f1[d],f2[d] ,f3[d]); glColor3f(LUT[k][0],LUT[k][1],LUT[k++][2]); glVertex3f(f1[a],f2[a] ,f3[a]); glColor3f(LUT[k][0],LUT[k][1],LUT[k++][2]); glEnd(); glBegin(GL_POLYGON); //glVertex3f(f1[a],f2[a] ,f3[a]); glVertex3f(f1[e],f2[e] ,f3[e]); glColor3f(LUT[k][0],LUT[k][1],LUT[k++][2]); glVertex3f(f1[h],f2[h], f3[h]); glColor3f(LUT[k][0],LUT[k][1],LUT[k++][2]); //glVertex3f(f1[d],f2[d] ,f3[d]); glVertex3f(f1[g],f2[g], f3[g]); glColor3f(LUT[k][0],LUT[k][1],LUT[k++][2]); glVertex3f(f1[c],f2[c] ,f3[c]); glColor3f(LUT[k][0],LUT[k][1],LUT[k++][2]); glVertex3f(f1[f],f2[f] ,f3[f]); glColor3f(LUT[k][0],LUT[k][1],LUT[k++][2]); glVertex3f(f1[b],f2[b] ,f3[b]); glColor3f(LUT[k][0],LUT[k][1],LUT[k++][2]); glEnd(); /*length=sqrt(pow((f1[e]-f1[a]),2)+pow((f2[e]-f2[a]),2)+pow((f3[e]-f3[a]),2)); printf("\n%d",length);*/ } k++; } glEndList(); file.close(); k=1; QFile file1("/home/41407/op.txt"); if (!file1.open(QIODevice::ReadOnly | QIODevice::Text)) return; QTextStream in1(&file1); k=1; while (!in1.atEnd()) { QString line = in1.readLine(); // if(k<=125) { str1= line.section(' ', 1, 1); x=str1.toFloat(); str2=line.section(' ', 2, 2); y=str2.toFloat(); str3=line.section(' ', 3, 3); z=str3.toFloat(); displacement=sqrt(pow( (x-f1[k]),2)+pow((y-f2[k]),2)+pow((z-f3[k]),2)); //printf("\n %d : %d",k,displacement); glBegin(GL_POLYGON); //glColor3f(LUT[displacement][0],LUT[displacement][1],LUT[displacement][2]); glVertex3f(f1[k],f2[k],f3[k]); glEnd(); a1[k]=x+f1[k]; a2[k]=y+f2[k]; a3[k]=z+f3[k]; //printf("\nc: %f %f %f",x,y,z); //printf("\nf: %f %f %f",f1[k],f2[k],f3[k]); //printf("\na: %f %f %f",a1[k],a2[k],a3[k]); } k++; glEndList(); } } void final1::draw() { glPushAttrib(GL_ALL_ATTRIB_BITS); glMatrixMode(GL_PROJECTION); glPushMatrix(); glLoadIdentity(); GLfloat x = 3.0 * GLfloat(width()) / height(); glOrtho(-x, +x, -3.0, +3.0, 4.0, 15.0); glMatrixMode(GL_MODELVIEW); glPushMatrix(); glLoadIdentity(); glTranslatef(0.0, 0.0, -10.0); glScalef(scaling, scaling, scaling); glRotatef(rotationX, 1.0, 0.0, 0.0); glRotatef(rotationY, 0.0, 1.0, 0.0); glRotatef(rotationZ, 0.0, 0.0, 1.0); glEnable(GL_MULTISAMPLE); glCallList(glObject); glMatrixMode(GL_MODELVIEW); glPopMatrix(); glMatrixMode(GL_PROJECTION); glPopMatrix(); glPopAttrib(); } /*uint final1::colorAt(int x) { generateShade(); QPolygonF pts = m_hoverPoints->points(); for (int i=1; i < pts.size(); ++i) { if (pts.at(i-1).x() <= x && pts.at(i).x() >= x) { QLineF l(pts.at(i-1), pts.at(i)); l.setLength(l.length() * ((x - l.x1()) / l.dx())); return m_shade.pixel(qRound(qMin(l.x2(), (qreal(m_shade.width() - 1)))), qRound(qMin(l.y2(), qreal(m_shade.height() - 1)))); } } return 0;*/ //final1:: //} /*void final1::createGLObject() { makeCurrent(); //QPainter painter; QPixmap pm(20, 20); QPainter pmp(&pm); pmp.fillRect(0, 0, 10, 10, Qt::blue); pmp.fillRect(10, 10, 10, 10, Qt::lightGray); pmp.fillRect(0, 10, 10, 10, Qt::darkGray); pmp.fillRect(10, 0, 10, 10, Qt::darkGray); pmp.end(); QPalette pal = palette(); pal.setBrush(backgroundRole(), QBrush(pm)); //setAutoFillBackground(true); setPalette(pal); //GLfloat f1[150],f2[150],f3[150],a1[150],a2[150],a3[150]; int k=1,a,b,c,d,e,f,g,h; //int p=0; GLfloat x,y,z; int displacement; QString str1,str2,str3,str4,str5,str6,str7,str8; int red,green,blue,index=1; int LUT[8000][3]; for(red=0;red //glShadeModel(GL_LINE); glObject = glGenLists(1); glNewList(glObject, GL_COMPILE); //qglColor(QColor(120,255,210)); glLineWidth(1.0); //glColor3f(1,0,0); QFile file("/home/41407/input.txt"); if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) return; QTextStream in(&file); while (!in.atEnd()) { //glColor3f(LUT[k][0],LUT[k][1],LUT[k][2]); QString line = in.readLine(); if(k<=125) { //printf("\nline :%c",line); str1= line.section(',', 1, 1); str2=line.section(',', 2, 2); str3=line.section(',', 3, 3); x=str1.toFloat(); y=str2.toFloat(); z=str3.toFloat(); f1[k]=x; f2[k]=y; f3[k]=z; //printf("\nf: %f %f %f",f1[k],f2[k],f3[k]); } else if(k125) //for(p=0;p<6;p++) { //glColor3f(LUT[k][0],LUT[k][1],LUT[k][2]); update(); str1= line.section(',', 1, 1); str2=line.section(',', 2, 2); str3=line.section(',', 3, 3); str4= line.section(',', 4, 4); str5=line.section(',', 5, 5); str6=line.section(',', 6, 6); str7= line.section(',', 7, 7); str8=line.section(',', 8, 8); a=str1.toInt(); b=str2.toInt(); c=str3.toInt(); d=str4.toInt(); e=str5.toInt(); f=str6.toInt(); g=str7.toInt(); h=str8.toInt(); //for (p = 0; p < 6; p++) { // glBegin(GL_LINE_WIDTH); //glColor3f(LUT[126][0],LUT[126][1],LUT[126][2]); //update(); //glNormal3fv(&n[p][0]); //glVertex3f(f1[i],f2[i],f3[i]); glVertex3fv(&v[faces[i][1]][0]); glVertex3fv(&v[faces[i][2]][0]); glVertex3fv(&v[faces[i][3]][0]); //glEnd(); //} glBegin(GL_LINE_LOOP); //glColor3f(p*20,p*20,p); glColor3f(1,0,0); glVertex3f(f1[a],f2[a] ,f3[a]); //painter.fillRect(QRectF(f1[a],f2[a] ,f3[a], 2), Qt::magenta); glVertex3f(f1[b],f2[b] ,f3[b]); glVertex3f(f1[c],f2[c] ,f3[c]); glVertex3f(f1[d],f2[d] ,f3[d]); glVertex3f(f1[a],f2[a] ,f3[a]); glVertex3f(f1[e],f2[e] ,f3[e]); glVertex3f(f1[f],f2[f] ,f3[f]); glVertex3f(f1[g],f2[g], f3[g]); glVertex3f(f1[h],f2[h], f3[h]); glVertex3f(f1[d],f2[d] ,f3[d]); glVertex3f(f1[a],f2[a] ,f3[a]); //glColor3f(1,0,0); //QLinearGradient ( f1[a], f2[a], f1[b], f2[b] ); glEnd(); glBegin(GL_LINES); //glNormal3fv(&n[p][0]); //glColor3f(LUT[k][0],LUT[k][1],LUT[k][2]); glVertex3f(f1[e],f2[e] ,f3[e]); glVertex3f(f1[h],f2[h], f3[h]); glVertex3f(f1[g],f2[g], f3[g]); glVertex3f(f1[c],f2[c] ,f3[c]); glVertex3f(f1[f],f2[f] ,f3[f]); glVertex3f(f1[b],f2[b] ,f3[b]); glEnd(); } } k++; } glEndList(); qglColor(QColor(239, 255, 191)); glLineWidth(1.0); glColor3f(0,1,0); k=1; QFile file1("/home/41407/op.txt"); if (!file1.open(QIODevice::ReadOnly | QIODevice::Text)) return; QTextStream in1(&file1); k=1; while (!in1.atEnd()) { QString line = in1.readLine(); // if(k<=125) { str1= line.section(' ', 1, 1); x=str1.toFloat(); str2=line.section(' ', 2, 2); y=str2.toFloat(); str3=line.section(' ', 3, 3); z=str3.toFloat(); displacement=sqrt(pow( (x-f1[k]),2)+pow((y-f2[k]),2)+pow((z-f3[k]),2)); printf("\n %d : %d",k,displacement); glBegin(GL_POINT); glColor3f(LUT[displacement][0],LUT[displacement][1],LUT[displacement][2]); glVertex3f(x,y,z); glLoadIdentity(); glEnd(); a1[k]=x+f1[k]; a2[k]=y+f2[k]; a3[k]=z+f3[k]; //printf("\nc: %f %f %f",x,y,z); //printf("\nf: %f %f %f",f1[k],f2[k],f3[k]); //printf("\na: %f %f %f",a1[k],a2[k],a3[k]); } k++; glEndList(); } }*/ /*void final1::draw() { glPushAttrib(GL_ALL_ATTRIB_BITS); glMatrixMode(GL_PROJECTION); glPushMatrix(); glLoadIdentity(); GLfloat x = 3.0 * GLfloat(width()) / height(); glOrtho(-x, +x, -3.0, +3.0, 4.0, 15.0); glMatrixMode(GL_MODELVIEW); glPushMatrix(); glLoadIdentity(); glTranslatef(0.0, 0.0, -10.0); glScalef(scaling, scaling, scaling); glRotatef(rotationX, 1.0, 0.0, 0.0); glRotatef(rotationY, 0.0, 1.0, 0.0); glRotatef(rotationZ, 0.0, 0.0, 1.0); glEnable(GL_MULTISAMPLE); glCallList(glObject); glMatrixMode(GL_MODELVIEW); glPopMatrix(); glMatrixMode(GL_PROJECTION); glPopMatrix(); glPopAttrib(); }*/ I need to change the color of a portion of beam where pressure is applied.But I am not able to color the front end back phase.

    Read the article

1