重构无边框窗体,鼠标拖动窗口改变大小功能,使得更加流畅不再依赖windows api

res/qss/dark_style.qss

@@ -99,32 +99,32 @@ QPushButton#btn_min,QPushButton#btn_max,QPushButton#btn_close{
 QPushButton#btn_min{
    image:url(":/res/img/btn/btn_min.png");
    border:none;
- width:25px;
+   width:20px;
- height:25px;
+   height:20px;
 }
 QPushButton#btn_max{
    image:url(":/res/img/btn/btn_max.png");
    border:none;
- width:25px;
+   width:20px;
- height:25px;
+   height:20px;
 }
 QPushButton#btn_max[maximizeProperty='maximize'] {
    image:url(":/res/img/btn/btn_max.png");
    border:none;
-   width:25px;
+   width:20px;
-   height:25px;
+   height:20px;
 }
 QPushButton#btn_max[maximizeProperty='restore'] {
    image:url(":/res/img/btn/btn_max_restore.png");
    border:none;
-   width:25px;
+   width:20px;
-   height:25px;
+   height:20px;
 }
 QPushButton#btn_close{
    image:url(":/res/img/btn/btn_close.png");
    border:none;
- width:25px;
+   width:20px;
- height:25px;
+   height:20px;
 }
 
 QPushButton#btn_min:hover,QPushButton#btn_max:hover,QPushButton#btn_close:hover{

res/qss/light_style.qss

@@ -73,32 +73,32 @@ QPushButton#btn_min,QPushButton#btn_max,QPushButton#btn_close{
 QPushButton#btn_min{
  image:url(":/res/img/btn/btn_min.png");
  border:none;
- width:25px;
+   width:20px;
- height:25px;
+   height:20px;
 }
 QPushButton#btn_max{
  image:url(":/res/img/btn/btn_max.png");
  border:none;
- width:25px;
+   width:20px;
- height:25px;
+   height:20px;
 }
 QPushButton#btn_max[maximizeProperty='maximize'] {
    image:url(":/res/img/btn/btn_max.png");
    border:none;
-   width:25px;
+   width:20px;
-   height:25px;
+   height:20px;
 }
 QPushButton#btn_max[maximizeProperty='restore'] {
    image:url(":/res/img/btn/btn_max_restore.png");
    border:none;
-   width:25px;
+   width:20px;
-   height:25px;
+   height:20px;
 }
 QPushButton#btn_close{
    image:url(":/res/img/btn/btn_close.png");
    border:none;
- width:25px;
+   width:20px;
- height:25px;
+   height:20px;
 }
 
 QPushButton#btn_min:hover,QPushButton#btn_max:hover,QPushButton#btn_close:hover{

src/sui.cpp

@@ -6,7 +6,7 @@ sui::sui(QWidget *parent)
       m_press(false),
       m_border_width(5)
 {
-    m_title=new sui_title(this);
+    m_title = new sui_title(this);
     setObjectName(tr("m_widget"));
     m_layout->addWidget(m_title);
     m_title->setMouseTracking(true);
@@ -22,7 +22,6 @@ sui::sui(QWidget *parent)
 }
 sui::~sui()
 {
-    
 }
 void sui::showEvent(QShowEvent *event)
 {
@@ -41,78 +40,242 @@ void sui::paintEvent(QPaintEvent *event)
     QWidget::paintEvent(event);
 }
 
-void sui::mousePressEvent(QMouseEvent *event)
+void sui::region(const QPoint &currentGlobalPoint)
 {
-    if ((event->button() == Qt::LeftButton))
+    // 获取窗体在屏幕上的位置区域，topLeft为坐上角点，rightButton为右下角点
+    QRect rect = this->rect();
+    
+    // 将左上角的(0,0)转化为全局坐标
+    QPoint topLeft = this->mapToGlobal(rect.topLeft()); 
+    QPoint rightButton = this->mapToGlobal(rect.bottomRight());
+    
+    // 当前鼠标的坐标
+    int x = currentGlobalPoint.x(); 
+    int y = currentGlobalPoint.y();
+
+    if (((topLeft.x() + m_border_width >= x) && (topLeft.x() <= x)) && ((topLeft.y() + m_border_width >= y) && (topLeft.y() <= y)))
     {
-        m_press = true;
+        // 左上角
-        m_point = (event->globalPosition() - this->pos()).toPoint();
+        ori = LEFTTOP;
-        event->accept();
+        // 设置光标形状
+        this->setCursor(QCursor(Qt::SizeFDiagCursor)); 
+    }
+    else if (((x >= rightButton.x() - m_border_width) && (x <= rightButton.x())) && ((y >= rightButton.y() - m_border_width) && (y <= rightButton.y())))
+    {
+        // 右下角
+        ori = RIGHTBOTTOM;
+        this->setCursor(QCursor(Qt::SizeFDiagCursor));
+    }
+    else if (((x <= topLeft.x() + m_border_width) && (x >= topLeft.x())) && ((y >= rightButton.y() - m_border_width) && (y <= rightButton.y())))
+    {
+        // 左下角
+        ori = LEFTBOTTOM;
+        this->setCursor(QCursor(Qt::SizeBDiagCursor));
+    }
+    else if (((x <= rightButton.x()) && (x >= rightButton.x() - m_border_width)) && ((y >= topLeft.y()) && (y <= topLeft.y() + m_border_width)))
+    {
+        // 右上角
+        ori = RIGHTTOP;
+        this->setCursor(QCursor(Qt::SizeBDiagCursor));
+    }
+    else if ((x <= topLeft.x() + m_border_width) && (x >= topLeft.x()))
+    {
+        // 左边
+        ori = LEFT;
+        this->setCursor(QCursor(Qt::SizeHorCursor));
+    }
+    else if ((x <= rightButton.x()) && (x >= rightButton.x() - m_border_width))
+    {
+        // 右边
+        ori = RIGHT;
+        this->setCursor(QCursor(Qt::SizeHorCursor));
+    }
+    else if ((y >= topLeft.y()) && (y <= topLeft.y() + m_border_width))
+    {
+        // 上边
+        ori = UP;
+        this->setCursor(QCursor(Qt::SizeVerCursor));
+    }
+    else if ((y <= rightButton.y()) && (y >= rightButton.y() - m_border_width))
+    {
+        // 下边
+        ori = DOWN;
+        this->setCursor(QCursor(Qt::SizeVerCursor));
+    }
+    else
+    {
+        // 默认
+        ori = NONE;
+        this->setCursor(QCursor(Qt::ArrowCursor));
     }
 }
 
+void sui::mousePressEvent(QMouseEvent *event)
+{
+    switch (event->button())
+    {
+    case Qt::LeftButton:
+        m_press = true;
+
+        if (ori != NONE)
+        {
+            // 返回当前抓取鼠标输入的窗口
+            this->mouseGrabber();
+        }
+        else
+        {
+            m_point = event->globalPosition().toPoint() - this->frameGeometry().topLeft();
+            // globalPos()鼠标位置，topLeft()窗口左上角的位置
+        }
+        break;
+    case Qt::RightButton:
+        this->setWindowState(Qt::WindowMinimized);
+        break;
+    default:
+        QWidget::mousePressEvent(event);
+    }
+}
 void sui::mouseMoveEvent(QMouseEvent *event)
 {
-    if (m_press)
+
+    QPoint globalPoint = event->globalPosition().toPoint();
+
+    QRect rect = this->rect();
+    QPoint topLeft = mapToGlobal(rect.topLeft());
+    QPoint bottomRight = mapToGlobal(rect.bottomRight());
+
+    if (this->windowState() != Qt::WindowMaximized)
     {
+        // 没有按下左键时
+        if (!m_press)
+        {
+            // 窗口大小的改变——判断鼠标位置，改变光标形状
+            this->region(globalPoint);
+        }
+        else
+        {
+            if (ori != NONE)
+            {
+                QRect newRect(topLeft, bottomRight);
+
+                switch (ori)
+                {
+                case LEFT:
+
+                    if (bottomRight.x() - globalPoint.x() <= this->minimumWidth())
+                    {
+                        // 小于界面的最小宽度时，设置为左上角横坐标为窗口x
+                        newRect.setLeft(topLeft.x());
+                        // 只改变左边界
+                    }
+                    else
+                    {
+                        newRect.setLeft(globalPoint.x());
+                    }
+                    break;
+                case RIGHT:
+                    // 只能改变右边界
+                    newRect.setWidth(globalPoint.x() - topLeft.x());
+                    break;
+                case UP:
+                    if (bottomRight.y() - globalPoint.y() <= this->minimumHeight())
+                    {
+                        newRect.setY(topLeft.y());
+                    }
+                    else
+                    {
+                        newRect.setY(globalPoint.y());
+                    }
+                    break;
+                case DOWN:
+                    newRect.setHeight(globalPoint.y() - topLeft.y());
+                    break;
+                case LEFTTOP:
+                    if (bottomRight.x() - globalPoint.x() <= this->minimumWidth())
+                    {
+                        newRect.setX(topLeft.x());
+                    }
+                    else
+                    {
+                        newRect.setX(globalPoint.x());
+                    }
+
+                    if (bottomRight.y() - globalPoint.y() <= this->minimumHeight())
+                    {
+                        newRect.setY(topLeft.y());
+                    }
+                    else
+                    {
+                        newRect.setY(globalPoint.y());
+                    }
+                    break;
+                case RIGHTTOP:
+                    if (globalPoint.x() - topLeft.x() >= this->minimumWidth())
+                    {
+                        newRect.setWidth(globalPoint.x() - topLeft.x());
+                    }
+                    else
+                    {
+                        newRect.setWidth(bottomRight.x() - topLeft.x());
+                    }
+                    if (bottomRight.y() - globalPoint.y() >= this->minimumHeight())
+                    {
+                        newRect.setY(globalPoint.y());
+                    }
+                    else
+                    {
+                        newRect.setY(topLeft.y());
+                    }
+                    break;
+                case LEFTBOTTOM:
+                    if (bottomRight.x() - globalPoint.x() >= this->minimumWidth())
+                    {
+                        newRect.setX(globalPoint.x());
+                    }
+                    else
+                    {
+                        newRect.setX(topLeft.x());
+                    }
+                    if (globalPoint.y() - topLeft.y() >= this->minimumHeight())
+                    {
+                        newRect.setHeight(globalPoint.y() - topLeft.y());
+                    }
+                    else
+                    {
+                        newRect.setHeight(bottomRight.y() - topLeft.y());
+                    }
+                    break;
+                case RIGHTBOTTOM:
+                    newRect.setWidth(globalPoint.x() - topLeft.x());
+                    newRect.setHeight(globalPoint.y() - topLeft.y());
+                    break;
+                default:
+                    break;
+                }
+                this->setGeometry(newRect);
+            }
+            else
+            {
+                // 移动窗口
                 move(event->globalPosition().toPoint() - m_point);
                 event->accept();
             }
+        }
+    }
 }
 
+// 鼠标释放事件
 void sui::mouseReleaseEvent(QMouseEvent *event)
 {
-    Q_UNUSED(event)
+    if (event->button() == Qt::LeftButton)
+    {
         m_press = false;
-}
+        if (ori != NONE)
-
-bool sui::nativeEvent(const QByteArray &eventType, void *message, qintptr *result)
-{
-    //Q_UNUSED(eventType)
-
-    MSG *param = static_cast<MSG *>(message);
-
-    switch (param->message)
         {
-    case WM_NCHITTEST:
+            // 释放鼠标抓取
-    {
+            this->releaseMouse();
-        int nX = GET_X_LPARAM(param->lParam) - this->geometry().x();
+            this->setCursor(QCursor(Qt::ArrowCursor));
-        int nY = GET_Y_LPARAM(param->lParam) - this->geometry().y();
+            ori = NONE;
-
-        // 如果鼠标位于子控件上，则不进行处理
-        if (childAt(nX, nY) != nullptr)
-            return QWidget::nativeEvent(eventType, message, result);
-
-        *result = HTCAPTION;
-
-        // 鼠标区域位于窗体边框，进行缩放
-        if ((nX > 0) && (nX < m_border_width))
-            *result = HTLEFT;
-
-        if ((nX > this->width() - m_border_width) && (nX < this->width()))
-            *result = HTRIGHT;
-
-        if ((nY > 0) && (nY < m_border_width))
-            *result = HTTOP;
-
-        if ((nY > this->height() - m_border_width) && (nY < this->height()))
-            *result = HTBOTTOM;
-
-        if ((nX > 0) && (nX < m_border_width) && (nY > 0) && (nY < m_border_width))
-            *result = HTTOPLEFT;
-
-        if ((nX > this->width() - m_border_width) && (nX < this->width()) && (nY > 0) && (nY < m_border_width))
-            *result = HTTOPRIGHT;
-
-        if ((nX > 0) && (nX < m_border_width) && (nY > this->height() - m_border_width) && (nY < this->height()))
-            *result = HTBOTTOMLEFT;
-
-        if ((nX > this->width() - m_border_width) && (nX < this->width()) && (nY > this->height() - m_border_width) && (nY < this->height()))
-            *result = HTBOTTOMRIGHT;
-
-        return true;
         }
     }
-
-    return QWidget::nativeEvent(eventType, message, result);
 }

src/sui.h

@@ -2,13 +2,20 @@
 #define SUI_H
 
 #include "common.h"
-#include <QMainWindow>
-#ifdef Q_OS_WIN
-#include <QWindow>
-#include <windowsx.h>
-#pragma execution_character_set("utf-8")
-#endif
 #include "sui_title.h"
+
+typedef enum { 
+    UP=0, 
+    DOWN=1, 
+    LEFT, 
+    RIGHT, 
+    LEFTTOP, 
+    LEFTBOTTOM, 
+    RIGHTBOTTOM, 
+    RIGHTTOP, 
+    NONE 
+}Orient;
+
 class sui : public QWidget
 {
     Q_OBJECT
@@ -16,12 +23,15 @@ public:
     explicit sui(QWidget *parent = 0);
     ~sui();
     sui_title* title() { return m_title; }
+    void region(const QPoint &currentGlobalPoint);  //鼠标的位置,改变光标
 private:
     QVBoxLayout *m_layout;
     QWidget     *m_widget;
     QPoint       m_point;
     bool         m_press;
     int          m_border_width;
+    Orient       ori;
+
     sui_title   *m_title;   
 protected:
     void paintEvent(QPaintEvent *event);
@@ -29,6 +39,5 @@ protected:
     void mouseMoveEvent(QMouseEvent *event);
     void mousePressEvent(QMouseEvent *event);
     void mouseReleaseEvent(QMouseEvent *event);
-    bool nativeEvent(const QByteArray &eventType, void *message, qintptr *result);
 };
 #endif // SUI_H