qtwidgets

问题 I'm trying to implement Qt Menus customization, and I'm giving a feature to add same QAction more than once in the same RMB context menu. But when I try to do: myMenu->addAction( myAction ); myMenu->addAction( myAction ); Adding QAction twice, only one instance of QAction appear on the menu. Why can't I have more than one instances of QAction ? Is there any trick to achieve this? I was trying to clone/create a new action with all the propeties of previous action. But I don't know the way to

问题 I want a resize feature in a QWidget using Qt, like the one shown in the image below. I have used following tried following ways: using QSizeGrip , setSizeGripEnabled 回答1: For completeness I'm showing two examples: with and without the Qt Designer. Example using Qt Designer Check the sizeGripEnabled property: Preview from within the Qt Designer ( Form > Preview... ): Minimal application to show the dialog: #include <QtWidgets/QApplication> #include <QDialog> #include "ui_DialogButtonBottom.h"

问题 I want a resize feature in a QWidget using Qt, like the one shown in the image below. I have used following tried following ways: using QSizeGrip , setSizeGripEnabled 回答1: For completeness I'm showing two examples: with and without the Qt Designer. Example using Qt Designer Check the sizeGripEnabled property: Preview from within the Qt Designer ( Form > Preview... ): Minimal application to show the dialog: #include <QtWidgets/QApplication> #include <QDialog> #include "ui_DialogButtonBottom.h"

问题 I need to alter three progress bars simultaneously in three WINAPI threads. Since my funtions, that change value of progress bars are to have access to these bars, they are members of MainWindow class. So i created wrappers with signature that is required by CreateThread function, but I still get segmentation fault when I try to start my threads. What it can be caused by and how to handle this and get my code to work? Example of my function: DWORD MainWindow::ThreadFunc1() { for(int i = 0; i

问题 I created this simple UI with qtDesigner and I want to update my label every 10 seconds with the value of a function, but I have no idea how to do this.I've tried different things but nothing worked. def example(): ... return text UI: class Ui_Form(object): def setupUi(self, Form): Form.setObjectName("Form") Form.resize(400, 300) self.label = QtWidgets.QLabel(Form) self.label.setGeometry(QtCore.QRect(165, 125, 61, 16)) self.label.setObjectName("label") self.retranslateUi(Form) QtCore

问题 I want to have a QTreeView without an indentation on the left side increasing at each nesting level. I tried setting QTreeView::setIndentation(0) . It removes the indentations just as I want, however it also hides the tree arrows. Default behavior: With indentations ✗ With arrows ✔ After setIndentation(0) : Without indentations ✔ Without arrows ✗ Desired behavior: Without indentations ✔ With arrows ✔ So how can I achieve the result shown in the third example? Is there any standard way of

问题 I want to have a QTreeView without an indentation on the left side increasing at each nesting level. I tried setting QTreeView::setIndentation(0) . It removes the indentations just as I want, however it also hides the tree arrows. Default behavior: With indentations ✗ With arrows ✔ After setIndentation(0) : Without indentations ✔ Without arrows ✗ Desired behavior: Without indentations ✔ With arrows ✔ So how can I achieve the result shown in the third example? Is there any standard way of

问题 I'd like to access some functions of a dialog-type widget from my mainwindow.cpp . I've created a simple function in the widget class that returns an int, which looks like this: dialog.h: public: int getRowCountData(); dialog.cpp: int Dialog::getRowCountData() { return ui->tableWidget->rowCount(); } Usage: my mainWindow.h: private: Dialog *dialog; my mainwindow.cpp: dialog = new Dialog; int count = dialog->getRowCountData(); <<<<<--------------this throws a read access error! code: 0xc0000005

问题 I'm new to Qt and I'm trying to figure out a way to auto-resize in Qt. The goal is for the user to be able to drag the window to make it bigger and everything resizes to the size of the window. Does anyone have any tips? 来源： https://stackoverflow.com/questions/25571298/how-to-enable-resizing-of-a-window-in-qt

问题 According to documentation here http://doc.qt.io/qt-5/highdpi.html QT 5.4+ introduces high DPI support. However, either I’m missing something fundamental or the current support is still in very early stages. I’m writing a brand new application so I have a chance to do it right from the ground up. I understand that I would have to use layouts instead of fixed positioning etc, but there always going to be cases in which I would have to specify, for example a minimum/maximum size of a control. I