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[MSPAINT] Fix crash on zoom out

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- Check the denominator for zero for both zoomed width and height.
- Do not allow to move zoom slider above possible position.
- Move commonly used `zoomTo` function into new header file.

CORE-14539
This commit is contained in:
Stanislav Motylkov 2018-04-14 15:42:34 +03:00 • committed by Benedikt Freisen
parent 065e70048d
commit 955048e50a
5 changed files with 31 additions and 9 deletions
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8
base/applications/mspaint/toolsettings.cpp
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@ -4,6 +4,7 @@
* FILE: base/applications/mspaint/toolsettings.cpp
* PURPOSE: Window procedure of the tool settings window
* PROGRAMMERS: Benedikt Freisen
* Stanislav Motylkov
*/
/* INCLUDES *********************************************************/
@ -12,8 +13,6 @@
/* FUNCTIONS ********************************************************/
extern void zoomTo(int, int, int);
LRESULT CToolSettingsWindow::OnCreate(UINT nMsg, WPARAM wParam, LPARAM lParam, WINBOOL& bHandled)
{
RECT trackbarZoomPos = {1, 1, 1 + 40, 1 + 64};
@ -25,7 +24,10 @@ LRESULT CToolSettingsWindow::OnCreate(UINT nMsg, WPARAM wParam, LPARAM lParam, W
LRESULT CToolSettingsWindow::OnVScroll(UINT nMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{
zoomTo(125 << trackbarZoom.SendMessage(TBM_GETPOS, 0, 0), 0, 0);
if (!zoomTo(125 << trackbarZoom.SendMessage(TBM_GETPOS, 0, 0), 0, 0))
{
OnToolsModelZoomChanged(nMsg, wParam, lParam, bHandled);
}
return 0;
}