qt5

来源： https://stackoverflow.com/questions/27587922/storing-persistent-information-about-items-in-view

来源： https://stackoverflow.com/questions/27587922/storing-persistent-information-about-items-in-view

来源： https://stackoverflow.com/questions/32881947/how-to-make-an-item-drag-inside-a-circle-in-qml

来源： https://stackoverflow.com/questions/32881947/how-to-make-an-item-drag-inside-a-circle-in-qml

来源： https://stackoverflow.com/questions/50156082/changing-text-color-for-each-label-in-qcategoryaxis

问题 Let's say I have a custom widget and add it to the main window in qt. As you can see, the red area is the custom widget. What I want to do is when the mouse is pressed in the red area and moved, the whole window will move as well. I know how to simply implement mousePressEvent and mouseMoveEvent ; but when dealing with a window with the custom widget, I do not know how to move the whole window when mouse is pressed on the custom widget. Also I want to mention that I only want the window

问题 Using Qt 5.9 on Linux, I have a QComboBox with several labels. qc = new QComboBox; qc->addItem(tr("Red")); qc->addItem(tr("Green")); qc->addItem(tr("Blue")); Lets say a user activates the QComboBox and the 3 color labels are shown in the drop down list. The user then selects the 1st item (red). What I want to do is have the QComboBox display a different value than what was selected. I.e., if red is selected, then a number is shown, possibly 1 for the first item (or it could be an R for Red),

问题 Using Qt 5.9 on Linux, I have a QComboBox with several labels. qc = new QComboBox; qc->addItem(tr("Red")); qc->addItem(tr("Green")); qc->addItem(tr("Blue")); Lets say a user activates the QComboBox and the 3 color labels are shown in the drop down list. The user then selects the 1st item (red). What I want to do is have the QComboBox display a different value than what was selected. I.e., if red is selected, then a number is shown, possibly 1 for the first item (or it could be an R for Red),

问题 I'm using QMovie to play a webp animation on a QLabal, the code like: Foo::Foo() { movie_ = new QMovie("/path/to/my.webp", "", this); ui->label->setMovie(movie_); } void Foo::on_pushButton_clicked() { movie_->stop(); movie_->start(); } But when I play the animation, the frame stutters, like: I try to extract the webp frames by using QImage::save, the code like: QImageReader *reader = new QImageReader("/path/to/my.webp"); reader->setDecideFormatFromContent(true); for (int i = 0; i < reader-

问题 I'm using QMovie to play a webp animation on a QLabal, the code like: Foo::Foo() { movie_ = new QMovie("/path/to/my.webp", "", this); ui->label->setMovie(movie_); } void Foo::on_pushButton_clicked() { movie_->stop(); movie_->start(); } But when I play the animation, the frame stutters, like: I try to extract the webp frames by using QImage::save, the code like: QImageReader *reader = new QImageReader("/path/to/my.webp"); reader->setDecideFormatFromContent(true); for (int i = 0; i < reader-