新增加无边框背景透明窗体

bgdemo/bgdemo.pro

@@ -0,0 +1,23 @@
+#-------------------------------------------------
+#
+# Project created by QtCreator 2017-08-19T20:24:03
+#
+#-------------------------------------------------
+
+QT       += core gui
+
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
+
+TARGET = bgdemo
+TEMPLATE = app
+
+
+SOURCES += main.cpp\
+        widget.cpp
+
+HEADERS  += widget.h
+
+FORMS    += widget.ui
+
+RESOURCES += \
+    rc.qrc

bgdemo/main.cpp

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

bgdemo/rc.qrc

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+<RCC>
+    <qresource prefix="/">
+        <file>1.png</file>
+        <file>2.png</file>
+        <file>3.png</file>
+        <file>4.png</file>
+        <file>5.png</file>
+    </qresource>
+</RCC>

bgdemo/widget.cpp

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+#include "widget.h"
+#include "ui_widget.h"
+#include "qevent.h"
+#include "qdebug.h"
+
+Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget)
+{
+    ui->setupUi(this);
+
+    this->setAttribute(Qt::WA_TranslucentBackground);
+    this->setWindowFlags(Qt::FramelessWindowHint | Qt::WindowSystemMenuHint | Qt::WindowMinimizeButtonHint);
+    ui->widget->installEventFilter(this);
+    ui->widget->setStyleSheet(QString("background-image: url(:/%1.png);").arg(1));
+}
+
+Widget::~Widget()
+{
+    delete ui;
+}
+
+bool Widget::eventFilter(QObject *watched, QEvent *evt)
+{
+    static int index = 1;
+    static QPoint mousePoint;
+    static bool mousePressed = false;
+
+    QMouseEvent *event = static_cast<QMouseEvent *>(evt);
+    if (event->type() == QEvent::MouseButtonPress) {
+        if (event->button() == Qt::LeftButton) {
+            mousePressed = true;
+            mousePoint = event->globalPos() - this->pos();
+
+            if (index == 5) {
+                index = 1;
+            } else {
+                index++;
+            }
+
+            ui->widget->setStyleSheet(QString("background-image: url(:/%1.png);").arg(index));
+
+            return true;
+        } else {
+            exit(0);
+        }
+    } else if (event->type() == QEvent::MouseButtonRelease) {
+        mousePressed = false;
+        return true;
+    } else if (event->type() == QEvent::MouseMove) {
+        if (mousePressed && (event->buttons() && Qt::LeftButton)) {
+            this->move(event->globalPos() - mousePoint);
+            return true;
+        }
+    }
+
+    return QWidget::eventFilter(watched, event);
+}

bgdemo/widget.h

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+#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:
+    bool eventFilter(QObject *watched, QEvent *evt);
+
+private:
+    Ui::Widget *ui;
+};
+
+#endif // WIDGET_H

bgdemo/widget.ui

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+<?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>712</width>
+    <height>353</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Widget</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <property name="spacing">
+    <number>0</number>
+   </property>
+   <property name="leftMargin">
+    <number>0</number>
+   </property>
+   <property name="topMargin">
+    <number>0</number>
+   </property>
+   <property name="rightMargin">
+    <number>0</number>
+   </property>
+   <property name="bottomMargin">
+    <number>0</number>
+   </property>
+   <item>
+    <widget class="QWidget" name="widget" native="true">
+     <property name="styleSheet">
+      <string notr="true"/>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <layoutdefault spacing="6" margin="11"/>
+ <resources/>
+ <connections/>
+</ui>