QT项目之键盘控制光标移动

来源：互联网发布：mac系统中怎么激活ai 编辑：程序博客网时间：2024/05/17 08:13

今天学习了QT类中的键盘和鼠标事件，就写了一个很简单的应用程序来做测试。突然发现用Ｃ＋＋开发项目效率好高，什么都可以调用类，或者去继承某一个类，添加自己的函数就行。以前做图形界面和鼠标开发的时候，全是自己造轮子，用Ｃ语言开发，自己去读取/dev/input/event*接口，然后去处理获取到的input数据，那时候感觉好复杂，现在用QT直接一个类就搞定，界面效果如下:

屏幕中间的指针只能在坐标轴上移动，用上下左右键控制方向，有一个checkBox可选按钮来控制光标是否可以连续移动代码如下:

main.cpp

#include <QtGui/QApplication>#include "widget.h"int main(int argc, char *argv[]){    QApplication a(argc, argv);    Widget w;    w.show();        return a.exec();}

widget.h /* 有四个变量没有用到,分别是上下左右标志位，留着扩展 */

#ifndef WIDGET_H#define WIDGET_H#include <QWidget>#include <QKeyEvent>#include <QDebug>namespace Ui {class Widget;}class Widget : public QWidget{    Q_OBJECT    public:    explicit Widget(QWidget *parent = 0);    ~Widget();    private:    Ui::Widget *ui;    bool keyUp;    bool keyDown;    bool keyLeft;    bool keyRight;    bool flag;protected:    void keyPressEvent(QKeyEvent *event);    void keyReleaseEvent(QKeyEvent *event);};#endif // WIDGET_H

widget.cpp

#include "widget.h"#include "ui_widget.h"#include <QPalette>#include <QDebug>Widget::Widget(QWidget *parent) :    QWidget(parent),    ui(new Ui::Widget){    QPalette pa;    ui->setupUi(this);    pa.setColor(QPalette::WindowText,Qt::red);    ui->label->setPalette(pa);    //setFocus();    flag=1;   /* 看是否使用isAutoRepeat */    keyUp=false;    keyLeft=false;    keyRight=false;    keyDown=false;    ui->pushButton->move(180,130); /* set middle point */}Widget::~Widget(){    delete ui;}void Widget::keyPressEvent(QKeyEvent *event){}void Widget::keyReleaseEvent(QKeyEvent *event){    static int offset_x=0,offset_y=0;    flag =ui->checkBox->isChecked();    if(event->key() == Qt::Key_Up)    {        if(event->isAutoRepeat()&&(flag==0)) return;        if(offset_x==0)        {            offset_y=offset_y-10;            if(offset_y<-100)            offset_y=-100;            ui->pushButton->move(180+offset_x,130+offset_y);        }      }    if(event->key() == Qt::Key_Down)    {        if(event->isAutoRepeat()&&(flag==0)) return;        if(offset_x==0)        {            offset_y=offset_y+10;            if(offset_y>100)            offset_y=100;            ui->pushButton->move(180+offset_x,130+offset_y);        }      }    if(event->key() == Qt::Key_Left)    {        if(event->isAutoRepeat()&&(flag==0)) return;        if(offset_y==0)        {            offset_x=offset_x-10;            if(offset_x<-100)            offset_x=-100;            ui->pushButton->move(180+offset_x,130+offset_y);        }      }    if(event->key() == Qt::Key_Right)    {        if(event->isAutoRepeat()&&(flag==0)) return;        if(offset_y==0)        {            offset_x=offset_x+10;            if(offset_x>100)            offset_x=100;            ui->pushButton->move(180+offset_x,130+offset_y);        }      }}

widget.ui

<?xml version="1.0" encoding="UTF-8"?><ui version="4.0"> <class>Widget</class> <widget class="QWidget" name="Widget">  <property name="geometry">   <rect>    <x>0</x>    <y>0</y>    <width>400</width>    <height>300</height>   </rect>  </property>  <property name="windowTitle">   <string>Widget</string>  </property>  <widget class="Line" name="line">   <property name="geometry">    <rect>     <x>80</x>     <y>130</y>     <width>200</width>     <height>16</height>    </rect>   </property>   <property name="orientation">    <enum>Qt::Horizontal</enum>   </property>  </widget>  <widget class="Line" name="line_2">   <property name="geometry">    <rect>     <x>180</x>     <y>30</y>     <width>16</width>     <height>200</height>    </rect>   </property>   <property name="orientation">    <enum>Qt::Vertical</enum>   </property>  </widget>  <widget class="QPushButton" name="pushButton">   <property name="geometry">    <rect>     <x>80</x>     <y>130</y>     <width>16</width>     <height>16</height>    </rect>   </property>   <property name="text">    <string>o</string>   </property>  </widget>  <widget class="QCheckBox" name="checkBox">   <property name="geometry">    <rect>     <x>270</x>     <y>240</y>     <width>81</width>     <height>21</height>    </rect>   </property>   <property name="text">    <string>speed</string>   </property>  </widget>  <widget class="QLabel" name="label">   <property name="geometry">    <rect>     <x>100</x>     <y>0</y>     <width>161</width>     <height>21</height>    </rect>   </property>   <property name="text">    <string>光标在数轴上移动演示</string>   </property>   <property name="alignment">    <set>Qt::AlignCenter</set>   </property>  </widget> </widget> <layoutdefault spacing="6" margin="11"/> <resources/> <connections/></ui>

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