Finally, I solved it. When I use ui->colorBarWidget->setAutoFillBackground(true) , all colours are visible. This is default false. In addition, you are right about size. Thank you very much.
> On 06 Apr 2016, at 14:54, Berkay Elbir <berkayel...@gmail.com> wrote: > > Hello, > > Thank you for your answer. But I tried same code, still can not see color. I > also fixed the size > > ui->colorBarWidget->setFixedSize(71,275); > > I put a button to test my widget is problem or not but it shows button. I do > not understand. Is Your designer file different or what is the version of > your qt? > > <mainWindow.PNG> > > > > My versions are 5.5.1 or 5.6.0 > > Thanks, > > Berkay > > On Thu, Mar 31, 2016 at 5:20 PM, Murphy, Sean <smur...@walbro.com > <mailto:smur...@walbro.com>> wrote: > Try changing your setBrush line to: > > palette.setBrush(QPalette::Window, gradient); > > When I do that I get the following: > > <image001.png> > > > > Also, note that this line > > QLinearGradient > gradient(ui->colorBarWidget->rect().topLeft(),ui->colorBarWidget->rect().topRight()); > > Depending on when you call it may not give you the results you’re expecting. > If I put your code in my MainWindow constructor I get the picture above. This > is because after construction, a resize event happens, so the original > gradient calculation was using a different rect width than what the user > sees. If you instead create a slot that is connected to a single shot timer > like so, you get a gradient that better utilizes the widget’s size. > > > > #include "mainwindow.h" > > #include "ui_mainwindow.h" > > > > #include <QPalette> > > #include <QLinearGradient> > > > > MainWindow::MainWindow(QWidget *parent) : > > QMainWindow(parent), > > ui(new Ui::MainWindow) > > { > > ui->setupUi(this); > > > > initTimer = new QTimer(this); > > connect(initTimer, SIGNAL(timeout()), SLOT(init())); > > initTimer->setSingleShot(true); > > initTimer->start(0); > > } > > > > MainWindow::~MainWindow() > > { > > delete ui; > > } > > > > void MainWindow::init() > > { > > QPalette palette; > > QLinearGradient > gradient(ui->colorBarWidget->rect().topLeft(),ui->colorBarWidget->rect().topRight()); > > > > gradient.setColorAt(0, Qt::blue); > > gradient.setColorAt(0.2, Qt::green); > > gradient.setColorAt(0.4, Qt::red); > > gradient.setColorAt(0.6, Qt::yellow); > > gradient.setColorAt(1, Qt::cyan); > > palette.setBrush(QPalette::Window, gradient); > > > > ui->colorBarWidget->setPalette(palette); > > } > > > > <image002.png> > > > > If you want this gradient to be correct all the time, I think you’ll either > need to set that widget to a fixed size, or you’ll have to create your own > custom widget and overload resizeEvent(QResizeEvent*) to keep recalculating > the gradient when the widget gets resized. > > > > Sean > > > > From: Interest [mailto:interest-bounces+smurphy > <mailto:interest-bounces%2Bsmurphy>=walbro....@qt-project.org > <mailto:walbro....@qt-project.org>] On Behalf Of Berkay Elbir > Sent: Thursday, March 31, 2016 8:19 AM > To: interest@qt-project.org <mailto:interest@qt-project.org> > Subject: [Interest] QPalette or QLinearGradient does not work on sub widget > > > > Hello all, > > I want to ask a question about QPalette and QLinearGradient. > > I want to brush my sub widget with QLinerGradient. I have created ui by using > QtDesigner. > > <http://i.stack.imgur.com/5JzSK.png> > But I can not brush this widget by using this code.(ui.colorBarWidget is > normal QWidget was created by QtDesigner.) > > QPalette palette; > QLinearGradient > gradient(ui.colorBarWidget->rect().topLeft(),ui.colorBarWidget->rect().topRight()); > > gradient.setColorAt(0, Qt::blue); > gradient.setColorAt(0.2, Qt::green); > gradient.setColorAt(0.4, Qt::red); > gradient.setColorAt(0.6, Qt::yellow); > gradient.setColorAt(1, Qt::cyan); > palette.setBrush(QPalette::Base, gradient); > > ui.colorBarWidget->setPalette(palette); > In addition this code works in stand alone QWidget application.This is its > output: > > <http://i.stack.imgur.com/z5fc5.png> > But I can not do same thing in my design. I can do this with styleSheet > > ui.colorBarWidget->setStyleSheet( "background-color: qlineargradient( x1:0 > y1:0, x2:0 y2:1, stop:0 blue, stop:1 red )" ); /* works */ > but why I can not do this with QPalette. > > Thanks in advance. > > > _______________________________________________ > Interest mailing list > Interest@qt-project.org <mailto:Interest@qt-project.org> > http://lists.qt-project.org/mailman/listinfo/interest > <http://lists.qt-project.org/mailman/listinfo/interest> > >
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