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[MSPAINT] Mouse Wheel support (#4195)

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Improve usability by mouse wheel handling. Plain wheel, Ctrl+Wheel, and Shift+Wheel. CORE-17937
This commit is contained in:
Katayama Hirofumi MZ 2021-12-27 22:20:22 +09:00 • committed by GitHub
parent 29718e009a
commit 90c3f89bb2
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GPG key ID: 4AEE18F83AFDEB23
10 changed files with 78 additions and 3 deletions
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50
base/applications/mspaint/winproc.cpp
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@ -157,6 +157,56 @@ void CMainWindow::InsertSelectionFromHBITMAP(HBITMAP bitmap, HWND window)
ForceRefreshSelectionContents();
}
LRESULT CMainWindow::OnMouseWheel(UINT nMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{
INT zDelta = (SHORT)HIWORD(wParam);
if (::GetAsyncKeyState(VK_CONTROL) < 0)
{
if (zDelta < 0)
{
if (toolsModel.GetZoom() > MIN_ZOOM)
zoomTo(toolsModel.GetZoom() / 2, 0, 0);
}
else if (zDelta > 0)
{
if (toolsModel.GetZoom() < MAX_ZOOM)
zoomTo(toolsModel.GetZoom() * 2, 0, 0);
}
}
else
{
UINT nCount = 3;
if (::GetAsyncKeyState(VK_SHIFT) < 0)
{
#ifndef SPI_GETWHEELSCROLLCHARS
#define SPI_GETWHEELSCROLLCHARS 0x006C // Needed for pre-NT6 PSDK
#endif
SystemParametersInfoW(SPI_GETWHEELSCROLLCHARS, 0, &nCount, 0);
for (UINT i = 0; i < nCount; ++i)
{
if (zDelta < 0)
::PostMessageW(scrollboxWindow, WM_HSCROLL, MAKEWPARAM(SB_LINEDOWN, 0), 0);
else if (zDelta > 0)
::PostMessageW(scrollboxWindow, WM_HSCROLL, MAKEWPARAM(SB_LINEUP, 0), 0);
}
}
else
{
SystemParametersInfoW(SPI_GETWHEELSCROLLLINES, 0, &nCount, 0);
for (UINT i = 0; i < nCount; ++i)
{
if (zDelta < 0)
::PostMessageW(scrollboxWindow, WM_VSCROLL, MAKEWPARAM(SB_LINEDOWN, 0), 0);
else if (zDelta > 0)
::PostMessageW(scrollboxWindow, WM_VSCROLL, MAKEWPARAM(SB_LINEUP, 0), 0);
}
}
}
return 0;
}
LRESULT CMainWindow::OnDropFiles(UINT nMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{
TCHAR droppedfile[MAX_PATH];