新增鼠标定位十字线

README.md

@@ -25,4 +25,5 @@
 | 22 | lineeditnext | 文本框回车焦点下移 |
 | 23 | zhtopy | 汉字转拼音 |
 | 24 | qwtdemo | qwt的源码版本，无需插件，直接源码集成到你的项目即可 |
-| 25 | buttondefence | 通用按钮地图效果 |
+| 25 | buttondefence | 通用按钮地图效果 |
+| 25 | mouseline | 鼠标定位十字线 |

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();
+}

mouseline/mouseline.pro

@@ -0,0 +1,20 @@
+#-------------------------------------------------
+#
+# Project created by QtCreator 2018-08-13T14:27:21
+#
+#-------------------------------------------------
+
+QT       += core gui
+
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
+
+TARGET = mouseline
+TEMPLATE = app
+
+
+SOURCES += main.cpp\
+        widget.cpp
+
+HEADERS  += widget.h
+
+FORMS    += widget.ui

mouseline/widget.cpp

@@ -0,0 +1,47 @@
+#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());
+}

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

mouseline/widget.ui

@@ -0,0 +1,20 @@
+<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>
+ <layoutDefault spacing="6" margin="11" />
+ <pixmapfunction></pixmapfunction>
+ <resources/>
+ <connections/>
+</ui>