maptool：

报错，没实现；

HPPA/ImageViewer.cpp

@@ -7,6 +7,7 @@
 
 #include "ImageViewer.h"
 #include "RasterLayer.h"
+#include "MapTool.h"
 
 
 #define VIEW_CENTER viewport()->rect().center()
@@ -105,6 +106,12 @@ bool Mapcavas::HasImage()
 
 void Mapcavas::wheelEvent(QWheelEvent *event)
 {
+    // Always let the tool have a chance first
+    if (m_mapTool)
+    {
+        m_mapTool->canvasWheelEvent(event);
+    }
+
     if (HasImage())
     {
         QPointF oldPos = mapToScene(event->pos());
@@ -126,6 +133,13 @@ void Mapcavas::scaling(qreal scaleFactor)
 
 void Mapcavas::mousePressEvent(QMouseEvent *event)
 {
+    if (m_mapTool)
+    {
+        m_mapTool->canvasMousePressEvent(event);
+        return;
+    }
+
+    // Legacy fallback when no tool is set
     if (event->button()==Qt::LeftButton)
     {
         m_bMouseTranslate = true;
@@ -150,6 +164,13 @@ void Mapcavas::mousePressEvent(QMouseEvent *event)
 
 void Mapcavas::mouseMoveEvent(QMouseEvent *event)
 {
+    if (m_mapTool)
+    {
+        m_mapTool->canvasMouseMoveEvent(event);
+        return;
+    }
+
+    // Legacy fallback
     if (m_bMouseTranslate){
         QPointF mouseDelta = mapToScene(event->pos()) - mapToScene(m_lastMousePos);
         translate(mouseDelta.x(),mouseDelta.y());
@@ -161,12 +182,25 @@ void Mapcavas::mouseMoveEvent(QMouseEvent *event)
 
 void Mapcavas::mouseReleaseEvent(QMouseEvent *event)
 {
+    if (m_mapTool)
+    {
+        m_mapTool->canvasMouseReleaseEvent(event);
+        return;
+    }
+
+    // Legacy fallback
     m_bMouseTranslate = false;
     QGraphicsView::mouseReleaseEvent(event);
 }
 
 void Mapcavas::mouseDoubleClickEvent(QMouseEvent *event)
 {
+    if (m_mapTool)
+    {
+        m_mapTool->canvasMouseDoubleClickEvent(event);
+        return;
+    }
+
     QGraphicsView::mouseDoubleClickEvent(event);
 }
 
@@ -248,3 +282,41 @@ void Mapcavas::freshmap(const RasterLayer::RenderParams& params)
     QPixmap pm = QPixmap::fromImage(img);
     SetImage(&pm);
 }
+
+// MapTool management
+void Mapcavas::setMapTool(MapTool* tool)
+{
+    if (m_mapTool)
+    {
+        m_mapTool->deactivate();
+    }
+
+    m_mapTool = tool;
+
+    if (m_mapTool)
+    {
+        // Disable built-in drag mode so the tool controls everything
+        setDragMode(QGraphicsView::NoDrag);
+        m_mapTool->activate();
+    }
+    else
+    {
+        // Restore legacy drag mode when no tool
+        setDragMode(QGraphicsView::ScrollHandDrag);
+    }
+}
+
+void Mapcavas::unsetMapTool(MapTool* tool)
+{
+    if (m_mapTool && m_mapTool == tool)
+    {
+        m_mapTool->deactivate();
+        m_mapTool = nullptr;
+        setDragMode(QGraphicsView::ScrollHandDrag);
+    }
+}
+
+MapTool* Mapcavas::mapTool() const
+{
+    return m_mapTool;
+}