canvas.h

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/*
 * PROJECT:     PAINT for ReactOS
 * LICENSE:     LGPL
 * FILE:        base/applications/mspaint/canvas.h
 * PURPOSE:     Providing the canvas window class
 * PROGRAMMERS: Benedikt Freisen
 */
 
#pragma once
 
class CCanvasWindow : public CWindowImpl<CCanvasWindow>
{
public:
    DECLARE_WND_CLASS_EX(_T("ReactOSPaintCanvas"), CS_DBLCLKS, COLOR_APPWORKSPACE)
 
    BEGIN_MSG_MAP(CCanvasWindow)
        MESSAGE_HANDLER(WM_SIZE, OnSize)
        MESSAGE_HANDLER(WM_PAINT, OnPaint)
        MESSAGE_HANDLER(WM_MOUSEMOVE, OnMouseMove)
        MESSAGE_HANDLER(WM_HSCROLL, OnHScroll)
        MESSAGE_HANDLER(WM_VSCROLL, OnVScroll)
        MESSAGE_HANDLER(WM_ERASEBKGND, OnEraseBkgnd)
        MESSAGE_HANDLER(WM_LBUTTONDOWN, OnLButtonDown)
        MESSAGE_HANDLER(WM_RBUTTONDOWN, OnRButtonDown)
        MESSAGE_HANDLER(WM_LBUTTONDBLCLK, OnLButtonDblClk)
        MESSAGE_HANDLER(WM_RBUTTONDBLCLK, OnRButtonDblClk)
        MESSAGE_HANDLER(WM_KEYDOWN, OnKeyDown)
        MESSAGE_HANDLER(WM_LBUTTONUP, OnLButtonUp)
        MESSAGE_HANDLER(WM_RBUTTONUP, OnRButtonUp)
        MESSAGE_HANDLER(WM_SETCURSOR, OnSetCursor)
        MESSAGE_HANDLER(WM_MOUSEWHEEL, OnMouseWheel)
        MESSAGE_HANDLER(WM_CANCELMODE, OnCancelMode)
        MESSAGE_HANDLER(WM_CAPTURECHANGED, OnCaptureChanged)
        MESSAGE_HANDLER(WM_CTLCOLOREDIT, OnCtlColorEdit)
    END_MSG_MAP()
 
    CCanvasWindow();
 
    BOOL m_drawing;
 
    VOID cancelDrawing();
    VOID finishDrawing();
    VOID Update(HWND hwndFrom);
 
    VOID ImageToCanvas(POINT& pt);
    VOID ImageToCanvas(RECT& rc);
    VOID CanvasToImage(POINT& pt, BOOL bZoomed = FALSE);
    VOID CanvasToImage(RECT& rc, BOOL bZoomed = FALSE);
    VOID GetImageRect(RECT& rc);
 
protected:
    CANVAS_HITTEST m_hitSelection;
    CANVAS_HITTEST m_whereHit;
    POINT m_ptOrig; // The origin of drag start
    CRect m_rcNew;
 
    CANVAS_HITTEST CanvasHitTest(POINT pt);
    RECT GetBaseRect();
    VOID DoDraw(HDC hDC, RECT& rcClient, RECT& rcPaint);
    VOID OnHVScroll(WPARAM wParam, INT fnBar);
    VOID drawZoomFrame(INT mouseX, INT mouseY);
 
    CANVAS_HITTEST SelectionHitTest(POINT ptZoomed);
    VOID StartSelectionDrag(CANVAS_HITTEST hit, POINT ptUnZoomed);
    VOID SelectionDragging(POINT ptUnZoomed);
    VOID EndSelectionDrag(POINT ptUnZoomed);
 
    LRESULT OnSize(UINT nMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
    LRESULT OnHScroll(UINT nMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
    LRESULT OnVScroll(UINT nMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
    LRESULT OnEraseBkgnd(UINT nMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
    LRESULT OnPaint(UINT nMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
    LRESULT OnLButtonDown(UINT nMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
    LRESULT OnRButtonDown(UINT nMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
    LRESULT OnLButtonDblClk(UINT nMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
    LRESULT OnRButtonDblClk(UINT nMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
    LRESULT OnMouseMove(UINT nMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
    LRESULT OnKeyDown(UINT nMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
    LRESULT OnLButtonUp(UINT nMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
    LRESULT OnRButtonUp(UINT nMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
    LRESULT OnSetCursor(UINT nMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
    LRESULT OnMouseWheel(UINT nMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
    LRESULT OnCancelMode(UINT nMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
    LRESULT OnCaptureChanged(UINT nMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
    LRESULT OnCtlColorEdit(UINT nMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
 
    LRESULT OnLRButtonDown(BOOL bLeftButton, UINT nMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
    LRESULT OnLRButtonDblClk(BOOL bLeftButton, UINT nMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
    LRESULT OnLRButtonUp(BOOL bLeftButton, UINT nMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
};