qwindow

Unable to paint on Qt Widget, shows error “paintEngine: Should no longer be called”

由 给你一囗甜甜゛ 提交于 2020-06-08 06:17:33
问题 I have created a widget using Qt Creator such a way that it has two sub windows inside a main window and some push buttons to load, save images, set pen width and color to paint on the window. But when i start to paint it gives me error saying QWidget::paintEngine: Should no longer be called QPainter::begin: Paint device returned engine == 0, type: 1 QPainter::setPen: Painter not active QPainter::drawPoints: Painter not active Does anyone know what mistake i am doing, i checked threads

Unable to paint on Qt Widget, shows error “paintEngine: Should no longer be called”

由 百般思念 提交于 2020-06-08 06:17:32
问题 I have created a widget using Qt Creator such a way that it has two sub windows inside a main window and some push buttons to load, save images, set pen width and color to paint on the window. But when i start to paint it gives me error saying QWidget::paintEngine: Should no longer be called QPainter::begin: Paint device returned engine == 0, type: 1 QPainter::setPen: Painter not active QPainter::drawPoints: Painter not active Does anyone know what mistake i am doing, i checked threads

How can I intercept and cancel the minimizing of a Window?

由 人走茶凉 提交于 2020-01-03 07:00:09
问题 I have a Window subclass in my project, and at runtime the instance is created and shown entirely on the QML side. I know that I can prevent the window from being minimized by not including the WindowMinimizeButtonHint in the flags: , but I actually need to have the minimize button present and enabled but be able to intercept the minimize button click, cancel the actual minimizing, and do something else (FYI my client is requiring this non-standard windowing behavior, not me). So far, the

Show Qt3D stuff inside QWidget in Qt5

由 不羁的心 提交于 2019-12-30 11:01:35
问题 So I felt all warm and fuzzy inside after reading that Qt3D has re-emerged in a v2.0 and is in fact becoming a part of Qt5 soon and that parts of it is already available for testing as a tech preview. I set out with a simple plan, I would have Qt3D working inside a widget in my existing C++/widgets based application. However the only example I could find that shows how to use Qt3D from C++ is called basicshapes-cpp, and it shows some shapes rendered in a separate OpenGL/Qt3D prepared window

Show Qt3D stuff inside QWidget in Qt5

由 时光总嘲笑我的痴心妄想 提交于 2019-12-30 11:01:09
问题 So I felt all warm and fuzzy inside after reading that Qt3D has re-emerged in a v2.0 and is in fact becoming a part of Qt5 soon and that parts of it is already available for testing as a tech preview. I set out with a simple plan, I would have Qt3D working inside a widget in my existing C++/widgets based application. However the only example I could find that shows how to use Qt3D from C++ is called basicshapes-cpp, and it shows some shapes rendered in a separate OpenGL/Qt3D prepared window

Show Qt3D stuff inside QWidget in Qt5

由 橙三吉。 提交于 2019-12-01 11:47:39
So I felt all warm and fuzzy inside after reading that Qt3D has re-emerged in a v2.0 and is in fact becoming a part of Qt5 soon and that parts of it is already available for testing as a tech preview. I set out with a simple plan, I would have Qt3D working inside a widget in my existing C++/widgets based application. However the only example I could find that shows how to use Qt3D from C++ is called basicshapes-cpp , and it shows some shapes rendered in a separate OpenGL/Qt3D prepared window (class that extends QWindow ) as opposed from a QWidget . Now I read about the role of QWindow vs.
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