Question

我使用Qt在C ++中创建了一个应用程序。我希望如果用户点击了名为btnA的按钮，那么程序应该仿效它，好像按下 A 一样。

我在谷歌搜索并找到了一个平台相关的解决方案。我希望它是跨平台的。有没有API？我更喜欢跨平台（或Linux）解决方案。

编辑： -

这是我的代码而不是wrking： -

#include "calculator.h"
#include "ui_calculator.h"
#include <QKeyEvent>

Calculator::Calculator(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::Calculator),
    DisplayString("")
{
     ui->setupUi(this);
     setFixedSize(this->size());

    //Connected all buttons to one slot 
     connect(ui->Button1,SIGNAL(clicked()),this,SLOT(CalButtonPressed()));
     connect(ui->Button2,SIGNAL(clicked()),this,SLOT(CalButtonPressed()));
     connect(ui->Button3,SIGNAL(clicked()),this,SLOT(CalButtonPressed()));
     connect(ui->Button4,SIGNAL(clicked()),this,SLOT(CalButtonPressed()));
     connect(ui->Button5,SIGNAL(clicked()),this,SLOT(CalButtonPressed()));
     connect(ui->Button6,SIGNAL(clicked()),this,SLOT(CalButtonPressed()));
     connect(ui->Button7,SIGNAL(clicked()),this,SLOT(CalButtonPressed()));
     connect(ui->Button8,SIGNAL(clicked()),this,SLOT(CalButtonPressed()));
     connect(ui->Button9,SIGNAL(clicked()),this,SLOT(CalButtonPressed()));
     connect(ui->Button0,SIGNAL(clicked()),this,SLOT(CalButtonPressed()));

     connect(ui->ButtonAddition,SIGNAL(clicked()),this,SLOT(CalButtonPressed()));
     connect(ui->ButtonMinus,SIGNAL(clicked()),this,SLOT(CalButtonPressed()));
     connect(ui->ButtonModulas,SIGNAL(clicked()),this,SLOT(CalButtonPressed()));
     connect(ui->ButtonDivide,SIGNAL(clicked()),this,SLOT(CalButtonPressed()));
     connect(ui->ButtonMultiplication,SIGNAL(clicked()),this,SLOT(CalButtonPressed()));
}

Calculator::~Calculator()
{
    delete ui;
}


void Calculator::CalButtonPressed()
{
    QPushButton *senderbtn = static_cast<QPushButton*>(sender());
    QString string = senderbtn->text();

    char ch = string.at(0).toLatin1();
// for testing I have taken only one button
    QKeyEvent * event = new QKeyEvent(QEvent::KeyPress,Qt::Key_A,Qt::NoModifier,nullptr);
    QApplication::postEvent(ui->Input,event);


}

的main.cpp

#include <QApplication>
#include <QFile>
#include <cstring>
#include "calculator.h"

int main(int argc,char **argv)
{
    QApplication *app= new QApplication(argc,argv);
    app->setWindowIcon(QIcon(":/Images/Icon.png"));


    Calculator *cal = new Calculator(nullptr);
    cal->show();

    return  app->exec();

}

它应该显示＆＃39; a＆＃39;在名为QLineEdit的{{1}}小部件中

Answer 1

您需要为此创建#!/usr/bin/env python from PyQt5.QtCore import (QRectF) from PyQt5.QtGui import (QPainter, QPixmap) from PyQt5.QtWidgets import (QMainWindow, QApplication, QGraphicsObject, QGraphicsView, QGraphicsScene) class TicTacToe(QGraphicsObject): def __init__(self, helper): super(TicTacToe, self).__init__() self.mypixmap = QPixmap("exit1.png") self.setAcceptHoverEvents(True) def paint(self, painter, option, widget): painter.setOpacity(1) painter.drawPixmap(0,0, 512, 512, self.mypixmap) painter.drawLine(2,2,20,20) def boundingRect(self): return QRectF(0,0,512, 512) def hoverMoveEvent(self, event): #print("hoverMoveEvent ", event.pos()) print("hoverMoveEvent", self.mapToScene(event.pos())) def mousePressEvent(self, event): #print("mousePressEvent", event.pos()) print("mousePressEvent", self.mapToScene(event.pos())) class MyGraphicsView(QGraphicsView): def __init__(self): super(MyGraphicsView, self).__init__() self.scene = QGraphicsScene(self) self.setMouseTracking(True) self.tic_tac_toe = TicTacToe(self) self.myScale = 2 self.tic_tac_toe.setScale(self.myScale) self.setScene(self.scene) self.scene.addItem(self.tic_tac_toe) def mouseMoveEvent(self, event): print("mouseMoveEvent", self.mapToScene(event.pos())) class Example(QMainWindow): def __init__(self): super(Example, self).__init__() self.y = MyGraphicsView() self.setCentralWidget(self.y) if __name__ == '__main__': import sys app = QApplication(sys.argv) w = Example() w.show() sys.exit(app.exec_())，如下所示。

QKeyEvent

上面的语法创建QKeyEvent *event = new QKeyEvent(QEvent::KeyPress, Qt::Key_A, Qt::NoModifier, 0);类型QKeyEvent，按键为 A ，并告知在此过程中没有按下修饰符。

创建后，您可以使用KeyPress将其添加到eventQueue。

postEvent

Qt您可以通过的文档，以便更好地了解您将要使用的内容：

我已经在Windows和Mac的跨平台解决方案中使用了上述内容。希望它也适用于linux。

更新：

由于您要使用文本更新行编辑，因此需要执行以下操作：

QApplication::postEvent(this, event);

这肯定会更新QKeyEvent *event = new QKeyEvent(QEvent::KeyPress, Qt::Key_A, Qt::NoModifier, QKeySequence(Qt::Key_A).toString()); // This is because QLineEdit does not deduce the text from the event type, but instead just adds the text it receives.字符＆＃39; A＆＃39;按下QLineEdit时。显然，在您使用上面创建的新button A致电postEvent后。

以跨平台方式处理C ++中的键盘

1 个答案: