Feature: Add zoom functionality for remote desktop viewer in non-control mode

server/2015Remote/ScreenSpyDlg.cpp

@@ -505,6 +505,7 @@ BEGIN_MESSAGE_MAP(CScreenSpyDlg, CDialog)
     ON_MESSAGE(WM_RECVFILEV2_CHUNK, &CScreenSpyDlg::OnRecvFileV2Chunk)
     ON_MESSAGE(WM_RECVFILEV2_COMPLETE, &CScreenSpyDlg::OnRecvFileV2Complete)
     ON_WM_DROPFILES()
+    ON_WM_CAPTURECHANGED()
 END_MESSAGE_MAP()
 
 
@@ -1618,9 +1619,18 @@ void CScreenSpyDlg::OnPaint()
 
     int srcW = m_BitmapInfor_Full->bmiHeader.biWidth;
     int srcH = m_BitmapInfor_Full->bmiHeader.biHeight;
-    if (m_bAdaptiveSize) {
     int dstW = m_CRect.Width();
     int dstH = m_CRect.Height();
+
+    // 放大模式渲染
+    if (m_bZoomedIn && !m_rcZoomSrc.IsRectEmpty()) {
+        // 使用放大区域作为源进行StretchBlt
+        StretchBlt(m_hFullDC, 0, 0, dstW, dstH,
+                   m_hFullMemDC,
+                   m_rcZoomSrc.left, m_rcZoomSrc.top,
+                   m_rcZoomSrc.Width(), m_rcZoomSrc.Height(),
+                   SRCCOPY);
+    } else if (m_bAdaptiveSize) {
         // 尺寸相同时用 BitBlt（更快），否则用 StretchBlt
         if (srcW == dstW && srcH == dstH) {
             BitBlt(m_hFullDC, 0, 0, srcW, srcH, m_hFullMemDC, 0, 0, SRCCOPY);
@@ -1631,6 +1641,24 @@ void CScreenSpyDlg::OnPaint()
         BitBlt(m_hFullDC, 0, 0, srcW, srcH, m_hFullMemDC, m_ulHScrollPos, m_ulVScrollPos, SRCCOPY);
     }
 
+    // 绘制框选矩形
+    if (m_bSelectingZoom) {
+        CRect rcSelect;
+        rcSelect.left = min(m_ptZoomStart.x, m_ptZoomCurrent.x);
+        rcSelect.top = min(m_ptZoomStart.y, m_ptZoomCurrent.y);
+        rcSelect.right = max(m_ptZoomStart.x, m_ptZoomCurrent.x);
+        rcSelect.bottom = max(m_ptZoomStart.y, m_ptZoomCurrent.y);
+
+        // 使用虚线边框绘制选择框
+        HPEN hPen = CreatePen(PS_DASH, 1, RGB(255, 0, 0));
+        HPEN hOldPen = (HPEN)SelectObject(m_hFullDC, hPen);
+        HBRUSH hOldBrush = (HBRUSH)SelectObject(m_hFullDC, GetStockObject(NULL_BRUSH));
+        Rectangle(m_hFullDC, rcSelect.left, rcSelect.top, rcSelect.right, rcSelect.bottom);
+        SelectObject(m_hFullDC, hOldBrush);
+        SelectObject(m_hFullDC, hOldPen);
+        DeleteObject(hPen);
+    }
+
     if ((m_bIsCtrl && m_Settings.RemoteCursor) || m_bIsTraceCursor) {
         CPoint ptLocal;
         GetCursorPos(&ptLocal);
@@ -1813,6 +1841,10 @@ void CScreenSpyDlg::OnSysCommand(UINT nID, LPARAM lParam)
     switch (nID) {
     case IDM_CONTROL: {
         m_bIsCtrl = !m_bIsCtrl;
+        // 进入控制模式时重置放大状态
+        if (m_bIsCtrl && m_bZoomedIn) {
+            ResetZoom();
+        }
         SysMenu->CheckMenuItem(IDM_CONTROL, m_bIsCtrl ? MF_CHECKED : MF_UNCHECKED);
         SetClassLongPtr(m_hWnd, GCLP_HCURSOR, m_bIsCtrl ? (LONG_PTR)m_hRemoteCursor : (LONG_PTR)LoadCursor(NULL, IDC_NO));
         // 控制模式：禁用本地 IME；查看模式：启用本地 IME
@@ -2565,6 +2597,11 @@ void CScreenSpyDlg::OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)
 
 void CScreenSpyDlg::EnterFullScreen()
 {
+    // 进入全屏时重置放大状态
+    if (m_bZoomedIn) {
+        ResetZoom();
+    }
+
     if (1) {
         // 1. 获取对话框当前所在的显示器
         HMONITOR hMonitor = MonitorFromWindow(m_hWnd, MONITOR_DEFAULTTONEAREST);
@@ -2652,6 +2689,11 @@ void CScreenSpyDlg::EnterFullScreen()
 // 全屏退出成功则返回true
 bool CScreenSpyDlg::LeaveFullScreen()
 {
+    // 退出全屏时重置放大状态
+    if (m_bZoomedIn) {
+        ResetZoom();
+    }
+
     if (1) {
         KillTimer(1);
         if (m_pToolbar) {
@@ -2692,14 +2734,165 @@ bool CScreenSpyDlg::LeaveFullScreen()
     return false;
 }
 
+// ========== 局部放大功能辅助函数 ==========
+
+// 重置放大状态
+void CScreenSpyDlg::ResetZoom()
+{
+    m_bZoomedIn = false;
+    m_bSelectingZoom = false;
+    m_bZoomDragging = false;
+    m_rcZoomSrc.SetRectEmpty();
+    Invalidate();
+}
+
+// 屏幕坐标转原图坐标（考虑放大状态）
+CPoint CScreenSpyDlg::ScreenToImage(CPoint pt)
+{
+    if (!m_BitmapInfor_Full) return pt;
+
+    int dstW = m_CRect.Width();
+    int dstH = m_CRect.Height();
+    if (dstW <= 0 || dstH <= 0) return pt;  // 防止除零
+
+    if (m_bZoomedIn && !m_rcZoomSrc.IsRectEmpty()) {
+        // 放大状态：从显示区域映射到放大区域
+        double scaleX = (double)m_rcZoomSrc.Width() / dstW;
+        double scaleY = (double)m_rcZoomSrc.Height() / dstH;
+        return CPoint(
+            (int)(m_rcZoomSrc.left + pt.x * scaleX),
+            (int)(m_rcZoomSrc.top + pt.y * scaleY)
+        );
+    } else if (m_bAdaptiveSize) {
+        // 自适应模式：按比例缩放
+        return CPoint((int)(pt.x * m_wZoom), (int)(pt.y * m_hZoom));
+    } else {
+        // 滚动模式：加上滚动偏移
+        return CPoint(pt.x + m_ulHScrollPos, pt.y + m_ulVScrollPos);
+    }
+}
+
+// 原图坐标转屏幕坐标（考虑放大状态）
+CPoint CScreenSpyDlg::ImageToScreen(CPoint pt)
+{
+    if (!m_BitmapInfor_Full) return pt;
+
+    int zoomW = m_rcZoomSrc.Width();
+    int zoomH = m_rcZoomSrc.Height();
+
+    if (m_bZoomedIn && zoomW > 0 && zoomH > 0) {
+        // 放大状态：从放大区域映射到显示区域
+        int dstW = m_CRect.Width();
+        int dstH = m_CRect.Height();
+        double scaleX = (double)dstW / zoomW;
+        double scaleY = (double)dstH / zoomH;
+        return CPoint(
+            (int)((pt.x - m_rcZoomSrc.left) * scaleX),
+            (int)((pt.y - m_rcZoomSrc.top) * scaleY)
+        );
+    } else if (m_bAdaptiveSize) {
+        if (m_wZoom > 0 && m_hZoom > 0) {
+            return CPoint((int)(pt.x / m_wZoom), (int)(pt.y / m_hZoom));
+        }
+        return pt;
+    } else {
+        return CPoint(pt.x - m_ulHScrollPos, pt.y - m_ulVScrollPos);
+    }
+}
+
 void CScreenSpyDlg::OnLButtonDown(UINT nFlags, CPoint point)
 {
+    // 非控制模式下的放大功能
+    if (!m_bIsCtrl && !m_bIsFirst && m_BitmapInfor_Full) {
+        if (m_bZoomedIn) {
+            // 放大状态：开始拖拽平移
+            m_bZoomDragging = true;
+            m_ptZoomDragStart = point;  // 保存起点用于点击检测
+            m_ptZoomDragLast = point;   // 用于增量拖拽计算
+            SetCapture();
+            return;
+        } else {
+            // 正常状态：开始框选放大区域
+            m_bSelectingZoom = true;
+            m_ptZoomStart = point;
+            m_ptZoomCurrent = point;
+            SetCapture();
+            return;
+        }
+    }
     __super::OnLButtonDown(nFlags, point);
 }
 
 
 void CScreenSpyDlg::OnLButtonUp(UINT nFlags, CPoint point)
 {
+    // 处理放大功能的鼠标释放
+    if (!m_bIsCtrl && !m_bIsFirst && m_BitmapInfor_Full) {
+        if (m_bSelectingZoom) {
+            // 完成框选
+            ReleaseCapture();
+            m_bSelectingZoom = false;
+
+            // 计算选择区域（确保left<right, top<bottom）
+            CRect rcSelect;
+            rcSelect.left = min(m_ptZoomStart.x, point.x);
+            rcSelect.top = min(m_ptZoomStart.y, point.y);
+            rcSelect.right = max(m_ptZoomStart.x, point.x);
+            rcSelect.bottom = max(m_ptZoomStart.y, point.y);
+
+            // 框选区域太小时视为点击，如果已放大则还原
+            if (rcSelect.Width() < 20 || rcSelect.Height() < 20) {
+                if (m_bZoomedIn) {
+                    ResetZoom();
+                }
+                return;
+            }
+
+            // 将屏幕坐标转换为原图坐标
+            int srcW = m_BitmapInfor_Full->bmiHeader.biWidth;
+            int srcH = m_BitmapInfor_Full->bmiHeader.biHeight;
+            int dstW = m_CRect.Width();
+            int dstH = m_CRect.Height();
+
+            if (m_bAdaptiveSize) {
+                m_rcZoomSrc.left = (int)(rcSelect.left * m_wZoom);
+                m_rcZoomSrc.top = (int)(rcSelect.top * m_hZoom);
+                m_rcZoomSrc.right = (int)(rcSelect.right * m_wZoom);
+                m_rcZoomSrc.bottom = (int)(rcSelect.bottom * m_hZoom);
+            } else {
+                m_rcZoomSrc.left = rcSelect.left + m_ulHScrollPos;
+                m_rcZoomSrc.top = rcSelect.top + m_ulVScrollPos;
+                m_rcZoomSrc.right = rcSelect.right + m_ulHScrollPos;
+                m_rcZoomSrc.bottom = rcSelect.bottom + m_ulVScrollPos;
+            }
+
+            // 限制在原图范围内
+            m_rcZoomSrc.left = max(0L, min(m_rcZoomSrc.left, (LONG)srcW));
+            m_rcZoomSrc.top = max(0L, min(m_rcZoomSrc.top, (LONG)srcH));
+            m_rcZoomSrc.right = max(0L, min(m_rcZoomSrc.right, (LONG)srcW));
+            m_rcZoomSrc.bottom = max(0L, min(m_rcZoomSrc.bottom, (LONG)srcH));
+
+            // 进入放大状态
+            m_bZoomedIn = true;
+            Invalidate();
+            return;
+        }
+
+        if (m_bZoomDragging) {
+            // 完成拖拽
+            ReleaseCapture();
+            m_bZoomDragging = false;
+
+            // 检查是否为点击（几乎没有移动）
+            int dx = abs(point.x - m_ptZoomDragStart.x);
+            int dy = abs(point.y - m_ptZoomDragStart.y);
+            if (dx < 5 && dy < 5) {
+                // 点击还原
+                ResetZoom();
+            }
+            return;
+        }
+    }
     __super::OnLButtonUp(nFlags, point);
 }
 
@@ -2725,6 +2918,66 @@ BOOL CScreenSpyDlg::OnMouseWheel(UINT nFlags, short zDelta, CPoint pt)
 
 void CScreenSpyDlg::OnMouseMove(UINT nFlags, CPoint point)
 {
+    // 处理放大功能的鼠标移动
+    if (!m_bIsCtrl && !m_bIsFirst && m_BitmapInfor_Full) {
+        if (m_bSelectingZoom) {
+            // 框选中：更新当前点并重绘选择框
+            m_ptZoomCurrent = point;
+            Invalidate(FALSE);  // FALSE表示不擦除背景，减少闪烁
+            return;
+        }
+
+        if (m_bZoomDragging) {
+            // 拖拽平移：计算偏移量并移动放大区域
+            int dx = point.x - m_ptZoomDragLast.x;
+            int dy = point.y - m_ptZoomDragLast.y;
+            m_ptZoomDragLast = point;  // 更新上一点（保持m_ptZoomDragStart不变用于点击检测）
+
+            // 计算缩放比例（添加除零保护）
+            int srcW = m_BitmapInfor_Full->bmiHeader.biWidth;
+            int srcH = m_BitmapInfor_Full->bmiHeader.biHeight;
+            int dstW = m_CRect.Width();
+            int dstH = m_CRect.Height();
+            int zoomW = m_rcZoomSrc.Width();
+            int zoomH = m_rcZoomSrc.Height();
+
+            if (dstW <= 0 || dstH <= 0 || zoomW <= 0 || zoomH <= 0) {
+                return;  // 防止除零
+            }
+
+            double scaleX = (double)zoomW / dstW;
+            double scaleY = (double)zoomH / dstH;
+
+            // 将屏幕偏移转换为原图偏移（方向相反）
+            int imgDx = (int)(-dx * scaleX);
+            int imgDy = (int)(-dy * scaleY);
+
+            // 移动放大区域
+            m_rcZoomSrc.OffsetRect(imgDx, imgDy);
+
+            // 限制在原图范围内
+            if (m_rcZoomSrc.left < 0) {
+                m_rcZoomSrc.right -= m_rcZoomSrc.left;
+                m_rcZoomSrc.left = 0;
+            }
+            if (m_rcZoomSrc.top < 0) {
+                m_rcZoomSrc.bottom -= m_rcZoomSrc.top;
+                m_rcZoomSrc.top = 0;
+            }
+            if (m_rcZoomSrc.right > srcW) {
+                m_rcZoomSrc.left -= (m_rcZoomSrc.right - srcW);
+                m_rcZoomSrc.right = srcW;
+            }
+            if (m_rcZoomSrc.bottom > srcH) {
+                m_rcZoomSrc.top -= (m_rcZoomSrc.bottom - srcH);
+                m_rcZoomSrc.bottom = srcH;
+            }
+
+            Invalidate(FALSE);
+            return;
+        }
+    }
+
     if (m_Settings.RemoteCursor) {
         if (m_pToolbar != NULL && ::IsWindow(m_pToolbar->m_hWnd) && m_pToolbar->IsWindowVisible()) {
             CRect rcToolbar;
@@ -2807,11 +3060,26 @@ void CScreenSpyDlg::OnActivate(UINT nState, CWnd* pWndOther, BOOL bMinimized)
 void CScreenSpyDlg::UpdateCtrlStatus(BOOL ctrl)
 {
     m_bIsCtrl = ctrl;
+    // 进入控制模式时重置放大状态
+    if (m_bIsCtrl && m_bZoomedIn) {
+        ResetZoom();
+    }
     SetClassLongPtr(m_hWnd, GCLP_HCURSOR, m_bIsCtrl ? (LONG_PTR)m_hRemoteCursor : (LONG_PTR)LoadCursor(NULL, IDC_NO));
     // 控制模式：禁用本地 IME；查看模式：启用本地 IME
     ImmAssociateContext(m_hWnd, m_bIsCtrl ? NULL : m_hOldIMC);
 }
 
+void CScreenSpyDlg::OnCaptureChanged(CWnd* pWnd)
+{
+    // 捕获丢失时重置框选/拖拽状态
+    if (m_bSelectingZoom || m_bZoomDragging) {
+        m_bSelectingZoom = false;
+        m_bZoomDragging = false;
+        Invalidate();
+    }
+    __super::OnCaptureChanged(pWnd);
+}
+
 void CScreenSpyDlg::OnDropFiles(HDROP hDropInfo)
 {
     if (m_bIsCtrl && m_bConnected) {

server/2015Remote/ScreenSpyDlg.h

@@ -223,6 +223,20 @@ public:
     double				m_wZoom=1, m_hZoom=1;
     bool				m_bMouseTracking = false;
 
+    // ========== 局部放大功能 ==========
+    bool                m_bZoomedIn = false;        // 是否处于放大状态
+    CRect               m_rcZoomSrc;                // 放大区域（原图坐标）
+    bool                m_bSelectingZoom = false;   // 是否正在框选
+    CPoint              m_ptZoomStart;              // 框选起点（屏幕坐标）
+    CPoint              m_ptZoomCurrent;            // 框选当前点（屏幕坐标）
+    bool                m_bZoomDragging = false;    // 是否正在拖拽平移
+    CPoint              m_ptZoomDragStart;          // 拖拽起点（用于点击检测）
+    CPoint              m_ptZoomDragLast;           // 拖拽上一点（用于增量计算）
+
+    void ResetZoom();                               // 重置放大状态
+    CPoint ScreenToImage(CPoint pt);                // 屏幕坐标转原图坐标
+    CPoint ImageToScreen(CPoint pt);                // 原图坐标转屏幕坐标
+
     CString             m_aviFile;
     CBmpToAvi	        m_aviStream;
 
@@ -302,6 +316,7 @@ public:
     afx_msg void OnMouseMove(UINT nFlags, CPoint point);
     afx_msg void OnMouseLeave();
     afx_msg void OnKillFocus(CWnd* pNewWnd);
+    afx_msg void OnCaptureChanged(CWnd* pWnd);
     afx_msg void OnSize(UINT nType, int cx, int cy);
     afx_msg void OnActivate(UINT nState, CWnd* pWndOther, BOOL bMinimized);
     afx_msg LRESULT OnDisconnect(WPARAM wParam, LPARAM lParam);