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[MSPAINT] Establish Undo/Redo management (#5347)
- Painting the canvas is done by overlaying the multiple layers. - Drawing each overlay is implemented as polymorphism of OOP. - Refine the Undo/Redo mechanism. - Some adjustments. CORE-17969
This commit is contained in:
Katayama Hirofumi MZ
GitHub
parent
b7071f67a8
commit
e8c7e30030
25 changed files with 721 additions and 504 deletions
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@ -22,103 +22,103 @@ void ImageModel::NotifyImageChanged()
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}
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ImageModel::ImageModel()
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: hDrawingDC(::CreateCompatibleDC(NULL))
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, currInd(0)
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, undoSteps(0)
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, redoSteps(0)
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: m_hDrawingDC(::CreateCompatibleDC(NULL))
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, m_currInd(0)
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, m_undoSteps(0)
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, m_redoSteps(0)
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{
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ZeroMemory(hBms, sizeof(hBms));
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ZeroMemory(m_hBms, sizeof(m_hBms));
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hBms[0] = CreateDIBWithProperties(1, 1);
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::SelectObject(hDrawingDC, hBms[0]);
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m_hBms[0] = CreateColorDIB(1, 1, RGB(255, 255, 255));
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m_hbmOld = ::SelectObject(m_hDrawingDC, m_hBms[0]);
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imageSaved = TRUE;
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g_imageSaved = TRUE;
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}
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ImageModel::~ImageModel()
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{
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::DeleteDC(hDrawingDC);
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::DeleteDC(m_hDrawingDC);
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for (size_t i = 0; i < HISTORYSIZE; ++i)
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{
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if (hBms[i])
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::DeleteObject(hBms[i]);
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if (m_hBms[i])
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::DeleteObject(m_hBms[i]);
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}
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}
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void ImageModel::Undo(BOOL bClearRedo)
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{
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ATLTRACE("%s: %d\n", __FUNCTION__, undoSteps);
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ATLTRACE("%s: %d\n", __FUNCTION__, m_undoSteps);
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if (!CanUndo())
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return;
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selectionModel.m_bShow = FALSE;
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selectionModel.HideSelection();
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// Select previous item
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currInd = (currInd + HISTORYSIZE - 1) % HISTORYSIZE;
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::SelectObject(hDrawingDC, hBms[currInd]);
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m_currInd = (m_currInd + HISTORYSIZE - 1) % HISTORYSIZE;
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::SelectObject(m_hDrawingDC, m_hBms[m_currInd]);
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undoSteps--;
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m_undoSteps--;
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if (bClearRedo)
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redoSteps = 0;
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else if (redoSteps < HISTORYSIZE - 1)
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redoSteps++;
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m_redoSteps = 0;
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else if (m_redoSteps < HISTORYSIZE - 1)
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m_redoSteps++;
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NotifyImageChanged();
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}
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void ImageModel::Redo()
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{
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ATLTRACE("%s: %d\n", __FUNCTION__, redoSteps);
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ATLTRACE("%s: %d\n", __FUNCTION__, m_redoSteps);
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if (!CanRedo())
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return;
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selectionModel.m_bShow = FALSE;
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selectionModel.HideSelection();
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// Select next item
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currInd = (currInd + 1) % HISTORYSIZE;
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::SelectObject(hDrawingDC, hBms[currInd]);
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m_currInd = (m_currInd + 1) % HISTORYSIZE;
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::SelectObject(m_hDrawingDC, m_hBms[m_currInd]);
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redoSteps--;
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if (undoSteps < HISTORYSIZE - 1)
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undoSteps++;
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m_redoSteps--;
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if (m_undoSteps < HISTORYSIZE - 1)
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m_undoSteps++;
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NotifyImageChanged();
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}
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void ImageModel::ResetToPrevious()
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{
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ATLTRACE("%s: %d\n", __FUNCTION__, currInd);
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ATLTRACE("%s: %d\n", __FUNCTION__, m_currInd);
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// Revert current item with previous item
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::DeleteObject(hBms[currInd]);
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hBms[currInd] = CopyDIBImage(hBms[(currInd + HISTORYSIZE - 1) % HISTORYSIZE]);
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::SelectObject(hDrawingDC, hBms[currInd]);
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::DeleteObject(m_hBms[m_currInd]);
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m_hBms[m_currInd] = CopyDIBImage(m_hBms[(m_currInd + HISTORYSIZE - 1) % HISTORYSIZE]);
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::SelectObject(m_hDrawingDC, m_hBms[m_currInd]);
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NotifyImageChanged();
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}
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void ImageModel::ClearHistory()
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{
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undoSteps = 0;
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redoSteps = 0;
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m_undoSteps = 0;
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m_redoSteps = 0;
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}
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void ImageModel::PushImageForUndo(HBITMAP hbm)
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{
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ATLTRACE("%s: %d\n", __FUNCTION__, currInd);
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ATLTRACE("%s: %d\n", __FUNCTION__, m_currInd);
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// Go to the next item with an HBITMAP or current item
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::DeleteObject(hBms[(currInd + 1) % HISTORYSIZE]);
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hBms[(currInd + 1) % HISTORYSIZE] = (hbm ? hbm : CopyDIBImage(hBms[currInd]));
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currInd = (currInd + 1) % HISTORYSIZE;
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::SelectObject(hDrawingDC, hBms[currInd]);
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::DeleteObject(m_hBms[(m_currInd + 1) % HISTORYSIZE]);
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m_hBms[(m_currInd + 1) % HISTORYSIZE] = (hbm ? hbm : CopyDIBImage(m_hBms[m_currInd]));
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m_currInd = (m_currInd + 1) % HISTORYSIZE;
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::SelectObject(m_hDrawingDC, m_hBms[m_currInd]);
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if (undoSteps < HISTORYSIZE - 1)
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undoSteps++;
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redoSteps = 0;
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if (m_undoSteps < HISTORYSIZE - 1)
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m_undoSteps++;
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m_redoSteps = 0;
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imageSaved = FALSE;
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g_imageSaved = FALSE;
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NotifyImageChanged();
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}
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@ -136,7 +136,7 @@ void ImageModel::Crop(int nWidth, int nHeight, int nOffsetX, int nOffsetY)
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return;
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// Select the HBITMAP by memory DC
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HDC hdcMem = ::CreateCompatibleDC(hDrawingDC);
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HDC hdcMem = ::CreateCompatibleDC(m_hDrawingDC);
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HGDIOBJ hbmOld = ::SelectObject(hdcMem, hbmCropped);
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// Fill background of the HBITMAP
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@ -146,7 +146,7 @@ void ImageModel::Crop(int nWidth, int nHeight, int nOffsetX, int nOffsetY)
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::DeleteObject(hbrBack);
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// Copy the old content
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::BitBlt(hdcMem, -nOffsetX, -nOffsetY, GetWidth(), GetHeight(), hDrawingDC, 0, 0, SRCCOPY);
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::BitBlt(hdcMem, -nOffsetX, -nOffsetY, GetWidth(), GetHeight(), m_hDrawingDC, 0, 0, SRCCOPY);
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// Clean up
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::SelectObject(hdcMem, hbmOld);
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@ -160,12 +160,12 @@ void ImageModel::Crop(int nWidth, int nHeight, int nOffsetX, int nOffsetY)
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void ImageModel::SaveImage(LPCTSTR lpFileName)
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{
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SaveDIBToFile(hBms[currInd], lpFileName, hDrawingDC);
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SaveDIBToFile(m_hBms[m_currInd], lpFileName, m_hDrawingDC);
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}
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BOOL ImageModel::IsImageSaved() const
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{
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return imageSaved;
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return g_imageSaved;
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}
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void ImageModel::StretchSkew(int nStretchPercentX, int nStretchPercentY, int nSkewDegX, int nSkewDegY)
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@ -176,17 +176,17 @@ void ImageModel::StretchSkew(int nStretchPercentX, int nStretchPercentY, int nSk
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INT newHeight = oldHeight * nStretchPercentY / 100;
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if (oldWidth != newWidth || oldHeight != newHeight)
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{
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HBITMAP hbm0 = CopyDIBImage(hBms[currInd], newWidth, newHeight);
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HBITMAP hbm0 = CopyDIBImage(m_hBms[m_currInd], newWidth, newHeight);
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PushImageForUndo(hbm0);
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}
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if (nSkewDegX)
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{
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HBITMAP hbm1 = SkewDIB(hDrawingDC, hBms[currInd], nSkewDegX, FALSE);
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HBITMAP hbm1 = SkewDIB(m_hDrawingDC, m_hBms[m_currInd], nSkewDegX, FALSE);
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PushImageForUndo(hbm1);
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}
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if (nSkewDegY)
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{
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HBITMAP hbm2 = SkewDIB(hDrawingDC, hBms[currInd], nSkewDegY, TRUE);
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HBITMAP hbm2 = SkewDIB(m_hDrawingDC, m_hBms[m_currInd], nSkewDegY, TRUE);
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PushImageForUndo(hbm2);
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}
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NotifyImageChanged();
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@ -194,31 +194,31 @@ void ImageModel::StretchSkew(int nStretchPercentX, int nStretchPercentY, int nSk
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int ImageModel::GetWidth() const
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{
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return GetDIBWidth(hBms[currInd]);
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return GetDIBWidth(m_hBms[m_currInd]);
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}
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int ImageModel::GetHeight() const
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{
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return GetDIBHeight(hBms[currInd]);
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return GetDIBHeight(m_hBms[m_currInd]);
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}
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void ImageModel::InvertColors()
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{
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RECT rect = {0, 0, GetWidth(), GetHeight()};
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PushImageForUndo();
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InvertRect(hDrawingDC, &rect);
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InvertRect(m_hDrawingDC, &rect);
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NotifyImageChanged();
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}
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HDC ImageModel::GetDC()
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{
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return hDrawingDC;
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return m_hDrawingDC;
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}
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void ImageModel::FlipHorizontally()
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{
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PushImageForUndo();
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StretchBlt(hDrawingDC, GetWidth() - 1, 0, -GetWidth(), GetHeight(), GetDC(), 0, 0,
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StretchBlt(m_hDrawingDC, GetWidth() - 1, 0, -GetWidth(), GetHeight(), GetDC(), 0, 0,
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GetWidth(), GetHeight(), SRCCOPY);
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NotifyImageChanged();
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}
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@ -226,7 +226,7 @@ void ImageModel::FlipHorizontally()
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void ImageModel::FlipVertically()
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{
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PushImageForUndo();
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StretchBlt(hDrawingDC, 0, GetHeight() - 1, GetWidth(), -GetHeight(), GetDC(), 0, 0,
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StretchBlt(m_hDrawingDC, 0, GetHeight() - 1, GetWidth(), -GetHeight(), GetDC(), 0, 0,
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GetWidth(), GetHeight(), SRCCOPY);
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NotifyImageChanged();
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}
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@ -238,7 +238,7 @@ void ImageModel::RotateNTimes90Degrees(int iN)
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case 1:
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case 3:
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{
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HBITMAP hbm = Rotate90DegreeBlt(hDrawingDC, GetWidth(), GetHeight(), iN == 1, FALSE);
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HBITMAP hbm = Rotate90DegreeBlt(m_hDrawingDC, GetWidth(), GetHeight(), iN == 1, FALSE);
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if (hbm)
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PushImageForUndo(hbm);
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break;
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@ -246,28 +246,25 @@ void ImageModel::RotateNTimes90Degrees(int iN)
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case 2:
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{
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PushImageForUndo();
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StretchBlt(hDrawingDC, GetWidth() - 1, GetHeight() - 1, -GetWidth(), -GetHeight(),
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hDrawingDC, 0, 0, GetWidth(), GetHeight(), SRCCOPY);
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StretchBlt(m_hDrawingDC, GetWidth() - 1, GetHeight() - 1, -GetWidth(), -GetHeight(),
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m_hDrawingDC, 0, 0, GetWidth(), GetHeight(), SRCCOPY);
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break;
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}
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}
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NotifyImageChanged();
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}
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void ImageModel::DeleteSelection()
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{
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if (!selectionModel.m_bShow)
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return;
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selectionModel.TakeOff();
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selectionModel.m_bShow = FALSE;
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selectionModel.ClearColor();
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selectionModel.ClearMask();
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NotifyImageChanged();
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}
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void ImageModel::Bound(POINT& pt) const
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{
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pt.x = max(0, min(pt.x, GetWidth()));
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pt.y = max(0, min(pt.y, GetHeight()));
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}
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HBITMAP ImageModel::CopyBitmap()
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{
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// NOTE: An app cannot select a bitmap into more than one device context at a time.
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::SelectObject(m_hDrawingDC, m_hbmOld); // De-select
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HBITMAP ret = CopyDIBImage(m_hBms[m_currInd]);
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m_hbmOld = ::SelectObject(m_hDrawingDC, m_hBms[m_currInd]); // Re-select
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return ret;
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}
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