彻底改版2.0

widget/movewidget/movewidget.cpp

@@ -0,0 +1,74 @@
+#include "movewidget.h"
+#include "qevent.h"
+#include "qdebug.h"
+
+MoveWidget::MoveWidget(QObject *parent) : QObject(parent)
+{
+    lastPoint = QPoint(0, 0);
+    pressed = false;
+    leftButton = true;
+    inControl = true;
+    widget = 0;
+}
+
+bool MoveWidget::eventFilter(QObject *watched, QEvent *event)
+{
+    if (widget != 0 && watched == widget) {
+        QMouseEvent *mouseEvent = (QMouseEvent *)event;
+        if (mouseEvent->type() == QEvent::MouseButtonPress) {
+            //如果限定了只能鼠标左键拖动则判断当前是否是鼠标左键
+            if (leftButton && mouseEvent->button() != Qt::LeftButton) {
+                return false;
+            }
+
+            //判断控件的区域是否包含了当前鼠标的坐标
+            if (widget->rect().contains(mouseEvent->pos())) {
+                lastPoint = mouseEvent->pos();
+                pressed = true;
+            }
+        } else if (mouseEvent->type() == QEvent::MouseMove && pressed) {
+            //计算坐标偏移值,调用move函数移动过去
+            int offsetX = mouseEvent->pos().x() - lastPoint.x();
+            int offsetY = mouseEvent->pos().y() - lastPoint.y();
+            int x = widget->x() + offsetX;
+            int y = widget->y() + offsetY;
+            if (inControl) {
+                //可以自行调整限定在容器中的范围,这里默认保留20个像素在里面
+                int offset = 20;
+                bool xyOut = (x + widget->width() < offset || y + widget->height() < offset);
+                bool whOut = false;
+                QWidget *w = (QWidget *)widget->parent();
+                if (w != 0) {
+                    whOut = (w->width() - x < offset || w->height() - y < offset);
+                }
+                if (xyOut || whOut) {
+                    return false;
+                }
+            }
+
+            widget->move(x, y);
+        } else if (mouseEvent->type() == QEvent::MouseButtonRelease && pressed) {
+            pressed = false;
+        }
+    }
+
+    return QObject::eventFilter(watched, event);
+}
+
+void MoveWidget::setLeftButton(bool leftButton)
+{
+    this->leftButton = leftButton;
+}
+
+void MoveWidget::setInControl(bool inControl)
+{
+    this->inControl = inControl;
+}
+
+void MoveWidget::setWidget(QWidget *widget)
+{
+    if (this->widget == 0) {
+        this->widget = widget;
+        this->widget->installEventFilter(this);
+    }
+}