feat: add a new awesome feature

include/StellarX/Control.h

@@ -16,6 +16,16 @@
  * @作者: 我在人间做废物
  ******************************************************************************/
 #pragma once
+
+#ifndef _WIN32_WINNT
+#define _WIN32_WINNT 0x0600  
+#endif
+#ifndef WINVER
+#define WINVER _WIN32_WINNT
+#endif
+
+#include <windows.h>
+
 #include <vector>
 #include <memory>
 #include <easyx.h>
@@ -24,13 +34,19 @@
 #include <string>
 #include <functional>
 #include "CoreTypes.h"
-
 class Control
 {
 protected:
     int x, y;           // 左上角坐标
     int width, height;  // 控件尺寸
     bool dirty = true; // 是否重绘
+    bool show = true; // 是否显示
+
+    /* == 背景快照 ==  */
+    IMAGE* saveBkImage = nullptr;
+    int saveBkX = 0, saveBkY = 0;      // 快照保存起始坐标
+    int saveWidth = 0, saveHeight = 0; // 快照保存尺寸
+    bool hasSnap = false;     //  当前是否持有有效快照
 
     StellarX::RouRectangle rouRectangleSize; // 圆角矩形椭圆宽度和高度
 
@@ -40,7 +56,6 @@ protected:
     COLORREF* currentBorderColor = new COLORREF(); // 边框颜色
     LINESTYLE* currentLineStyle = new LINESTYLE(); // 保存当前线型
 
-public:
     Control(const Control&) = delete;
     Control& operator=(const Control&) = delete;
     Control(Control&&) = default;
@@ -48,25 +63,31 @@ public:
 
     Control() : x(0), y(0), width(100), height(100) {}
     Control(int x, int y, int width, int height)
-        : x(x), y(y), width(width), height(height) {
-    }
+        : x(x), y(y), width(width), height(height) {}
+public:
 
-    virtual ~Control() {
+    virtual ~Control()
+    {
         delete currentFont;
         delete currentColor;
         delete currentBkColor;
         delete currentBorderColor;
         delete currentLineStyle;
 
-		currentFont = nullptr;
+        currentFont = nullptr;
         currentColor = nullptr;
         currentBkColor = nullptr;
         currentBorderColor = nullptr;
         currentLineStyle = nullptr;
-
-
     }
+
 protected:
+    void saveBackground(int x, int y, int w, int h);
+    void restBackground();          // putimage 回屏
+    void discardBackground();          // 释放快照（窗口重绘/尺寸变化后必须作废）
+public:
+    //释放快照重新保存，在尺寸变化时更新背景快照避免尺寸变化导致显示错位
+    void updateBackground();
     // 获取位置和尺寸
     int getX() const { return x; }
     int getY() const { return y; }
@@ -74,16 +95,25 @@ protected:
     int getHeight() const { return height; }
     int getRight() const { return x + width; }
     int getBottom() const { return y + height; }
+    
+    void setX(int x) { this->x = x; dirty = true; }
+    void setY(int y) { this->y = y; dirty = true; }
+    void setWidth(int width) { this->width = width; dirty = true; }
+    void setHeight(int height) { this->height = height; dirty = true; }
 public:
     //设置是否重绘
     void setDirty(bool dirty) { this->dirty = dirty; }
+
     virtual void draw() = 0;
     virtual bool handleEvent(const ExMessage& msg) = 0;//返回true代表事件已消费
-    //用来检查非模态对话框是否可见，其他控件不用实现
-    virtual bool IsVisible() const = 0;
+
+    //设置是否显示
+     void setShow(bool show) { this->show = show; }
+    //检查控件是否可见
+     bool IsVisible() const { return show; };
+
     //用来检查对话框是否模态，其他控件不用实现
     virtual bool model()const = 0;
-
 protected:
     void saveStyle();
     void restoreStyle();