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#ifndef __ZOOMWND_H_
#define __ZOOMWND_H_
#define ZW_DRAWCOMPLETE (WM_USER+99) // PRIVATE
#define ZW_BACKDRAWCOMPLETE (WM_USER+100) // PRIVATE
// messages for the Preview Window
#define IV_SETIMAGEDATA (WM_USER+101)
#define IV_SCROLL (WM_USER+102)
#define IV_SETOPTIONS (WM_USER+104)
#define IV_ONCHANGENOTIFY (WM_USER+106)
#define IV_ISAVAILABLE (WM_USER+107)
typedef struct{ LONG x; LONG y; LONG cx; LONG cy;} PTSZ;
class CPreviewWnd;
class CZoomWnd : public CWindowImpl<CZoomWnd>{public: enum MODE { MODE_PAN, MODE_ZOOMIN, MODE_ZOOMOUT, MODE_NOACTION };
// public accessor functions
void ZoomIn(); // Does a zoom in, handles contraints
void ZoomOut(); // does a zoom out, handles boundry conditions and constraints
void ActualSize(); // show image at full size (crop if needed)
void BestFit(); // show full image in window (scale down if needed)
BOOL IsBestFit() { return m_fBestFit; }
void SetImageData(CDecodeTask * pImageData, BOOL bUpdate=TRUE); // used to set an image for display
HRESULT PrepareImageData(CDecodeTask * pImageData); // Draw an image in the back buffer
void SetPalette( HPALETTE hpal ); // If in palette mode, set this to the palette to use
void StatusUpdate( int iStatus ); // used to set m_iStrID to display correct status message
void Zoom( WPARAM wParam, LPARAM lParam ); BOOL SetMode( MODE modeNew ); BOOL ScrollBarsPresent(); BOOL SetScheduler(IShellTaskScheduler * pTaskScheduler); int QueryStatus() { return m_iStrID; }
// Annotation Functions
void GetVisibleImageWindowRect(LPRECT prectImage); void GetImageFromWindow(LPPOINT ppoint, int cSize); void GetWindowFromImage(LPPOINT ppoint, int cSize); CAnnotationSet* GetAnnotations() { return &m_Annotations; } void CommitAnnotations();
DWORD GetBackgroundColor(); CZoomWnd(CPreviewWnd *pPreview); ~CZoomWnd();
DECLARE_WND_CLASS( TEXT("ShImgVw:CZoomWnd") );
protected:BEGIN_MSG_MAP(CZoomWnd) MESSAGE_HANDLER(WM_CREATE, OnCreate) MESSAGE_HANDLER(WM_LBUTTONDOWN, OnMouseDown) MESSAGE_HANDLER(WM_MBUTTONDOWN, OnMouseDown) MESSAGE_HANDLER(WM_LBUTTONDBLCLK, OnMouseDown) MESSAGE_HANDLER(WM_ERASEBKGND, OnEraseBkgnd) MESSAGE_HANDLER(WM_LBUTTONUP, OnMouseUp) MESSAGE_HANDLER(WM_MBUTTONUP, OnMouseUp) MESSAGE_HANDLER(WM_MOUSEMOVE, OnMouseMove) MESSAGE_HANDLER(WM_SETCURSOR, OnSetCursor) MESSAGE_HANDLER(WM_KEYDOWN, OnKeyDown) MESSAGE_HANDLER(WM_KEYUP, OnKeyUp) MESSAGE_HANDLER(WM_PAINT, OnPaint) MESSAGE_HANDLER(WM_SIZE, OnSize) MESSAGE_HANDLER(WM_SETFOCUS, OnSetFocus) MESSAGE_HANDLER(WM_HSCROLL, OnScroll) MESSAGE_HANDLER(WM_VSCROLL, OnScroll) MESSAGE_HANDLER(WM_MOUSEWHEEL, OnWheelTurn) MESSAGE_HANDLER(ZW_DRAWCOMPLETE, OnDrawComplete) MESSAGE_HANDLER(ZW_BACKDRAWCOMPLETE, OnBackDrawComplete) MESSAGE_HANDLER(WM_DESTROY, OnDestroy)END_MSG_MAP()
// message handlers
LRESULT OnCreate(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); LRESULT OnEraseBkgnd(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); LRESULT OnPaint(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); LRESULT OnSize(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); LRESULT OnKeyDown(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); LRESULT OnKeyUp(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); LRESULT OnMouseMove(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); LRESULT OnMouseDown(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); LRESULT OnMouseUp(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); LRESULT OnSetCursor(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); LRESULT OnSetFocus(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); LRESULT OnWheelTurn(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); LRESULT OnDrawComplete(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); LRESULT OnBackDrawComplete(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); LRESULT OnDestroy(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
public: // This is lazy. These are used by CPreview so I made them public when they probably shouldn't be.
LRESULT OnScroll(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); int m_cxImage; // width of bitmap referenced by m_pImageData
int m_cyImage; // height of bitmap referenced by m_pImageData
float m_cxImgPhys; // actual width of the image in inches
float m_cyImgPhys; // actual height of the image in inches
int m_cxImgPix; // width of the image in screen pixels
int m_cyImgPix; // height of the image in screen pixels
float m_imgDPIx; float m_imgDPIy; float m_winDPIx; float m_winDPIy;
protected: BOOL m_fBestFit; // True if we are in Bets Fit mode
CDecodeTask * m_pImageData;// Handle to a IShellImageData object with render info
int m_cxCenter; // point to center on relative to image
int m_cyCenter; // point to center on relative to image
int m_cxVScroll; // width of a scroll bar
int m_cyHScroll; // height of a scroll bar
int m_cxWindow; // width of our client area + scroll width if scroll bar is visible
int m_cyWindow; // height of our client area + scroll height if scroll bar is visible
float m_cxWinPhys; // actual width of the client area in inches
float m_cyWinPhys; // actual height of the client in inches
int m_xPosMouse; // used to track mouse movement when dragging the LMB
int m_yPosMouse; // used to track mouse movement when dragging the LMB
MODE m_modeDefault; // The zoom or pan mode when the shift key isn't pressed
PTSZ m_ptszDest; // the point and size of the destination rectangle (window coordinates)
RECT m_rcCut; // the rectangle of the part of the image that will be visible (image coordinates)
RECT m_rcBleed; // the rectangle adjusted for pixelation effects (window coordinates)
BOOL m_fPanning; // true when we are panning (implies left mouse button is down)
BOOL m_fCtrlDown; // a mode modifier ( zoom <=> pan ), true if Ctrl Key is down
BOOL m_fShiftDown; // a mode modifier ( zoom in <=> zoom out), true if Shift Key is down
BOOL m_fTimerReady; // reset each time SetImageData is called, unset when timer is reset after OnDrawComplete
int m_iStrID; // string to display when no bitmap available
BOOL m_fFoundBackgroundColor; DWORD m_dwBackgroundColor;
HPALETTE m_hpal;
CPreviewWnd *m_pPreview; // do not delete this
CAnnotationSet m_Annotations;
Buffer * m_pFront; Buffer * m_pBack; UINT m_iIndex; // Index corresponding to the back buffer.
IShellTaskScheduler * m_pTaskScheduler;
// protected methods
void AdjustRectPlacement(); // applies constraints for centering, ensureinging maximum visibility, etc
void CalcCut(); // calculates the cut region that will be visible after a zoom
void CalcCut(PTSZ ptszDest, int cxImage, int cyImage, RECT &rcCut, RECT &rcBleed); void GetPTSZForBestFit(int cxImgPix, int cyImgPix, float cxImgPhys, float cyImgPhys, PTSZ &ptszDest); void SetScrollBars(); // ensures scroll bar state is correct. Used after window resize or zoom.
HRESULT PrepareDraw(); // draw the image in the background thread
void FlushDrawMessages(); // remove any pending draw tasks and messages
BOOL SwitchBuffers(UINT iIndex); void _UpdatePhysicalSize();};
#include "prevwnd.h"
#endif
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