彻底改版2.0

other/mouseline/main.cpp

@@ -0,0 +1,11 @@
+#include "widget.h"
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    Widget w;
+    w.show();
+
+    return a.exec();
+}

other/mouseline/mouseline.pro

@@ -0,0 +1,13 @@
+QT += core gui
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
+greaterThan(QT_MAJOR_VERSION, 5): QT += core5compat
+
+TARGET      = mouseline
+TEMPLATE    = app
+DESTDIR     = $$PWD/../bin
+CONFIG      += warn_off
+
+SOURCES     += main.cpp
+SOURCES     += widget.cpp
+HEADERS     += widget.h
+FORMS       += widget.ui

other/mouseline/widget.cpp

@@ -0,0 +1,45 @@
+#include "widget.h"
+#include "ui_widget.h"
+#include "qpainter.h"
+#include "qevent.h"
+#include "qdebug.h"
+
+Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget)
+{
+    ui->setupUi(this);
+    this->setMouseTracking(true);
+}
+
+Widget::~Widget()
+{
+    delete ui;
+}
+
+void Widget::mouseMoveEvent(QMouseEvent *event)
+{
+    lastPos = event->pos();
+    update();
+}
+
+void Widget::mouseReleaseEvent(QMouseEvent *event)
+{
+    //这里是鼠标按下的坐标,自己存到数据库
+    lastPos = event->pos();
+    update();
+    qDebug() << lastPos;
+}
+
+void Widget::paintEvent(QPaintEvent *)
+{
+    QPainter painter(this);
+
+    QPen pen;
+    pen.setWidth(5);
+    pen.setColor(Qt::red);
+    painter.setPen(pen);
+
+    //绘制横向线
+    painter.drawLine(0, lastPos.y(), width(), lastPos.y());
+    //绘制纵向线
+    painter.drawLine(lastPos.x(), 0, lastPos.x(), height());
+}

other/mouseline/widget.h

@@ -0,0 +1,28 @@
+#ifndef WIDGET_H
+#define WIDGET_H
+
+#include <QWidget>
+
+namespace Ui {
+class Widget;
+}
+
+class Widget : public QWidget
+{
+    Q_OBJECT
+
+public:
+    explicit Widget(QWidget *parent = 0);
+    ~Widget();
+
+protected:
+    void mouseMoveEvent(QMouseEvent *event);
+    void mouseReleaseEvent(QMouseEvent *event);
+    void paintEvent(QPaintEvent *);
+
+private:
+    Ui::Widget *ui;
+    QPoint lastPos;
+};
+
+#endif // WIDGET_H

other/mouseline/widget.ui

@@ -0,0 +1,20 @@
+<?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>鼠标十字线</string>
+  </property>
+ </widget>
+ <layoutdefault spacing="6" margin="11"/>
+ <resources/>
+ <connections/>
+</ui>