118 lines
3.0 KiB
C++
118 lines
3.0 KiB
C++
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/**********************************************************************
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Audacity: A Digital Audio Editor
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AttachableScrollBar.cpp
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James Crook
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Audacity is free software.
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This file is licensed under the wxWidgets license, see License.txt
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*****************************************************************//**
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\class AttachableScrollBar
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\brief An AttachableScrollBar is a scroll bar that can be attached
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to multiple items and so control their scrolling. Uses floats
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internally, not ints, allowing for (external) control of zooming.
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Limitations:
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- Currently horizontal only.
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- Attached item repainting not yet supported. Instead for now place the
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attached windows in an InvisiblePanel, and rely on refreshing of
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the invisible panel to refresh each of the objects.
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- Currently closely tied to the mViewInfo class. This will change
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to make the class much more generic.
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*//*******************************************************************/
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#include "../Audacity.h"
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#include <wx/wxprec.h>
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#include "AttachableScrollBar.h"
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#include "../ViewInfo.h"
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BEGIN_EVENT_TABLE(AttachableScrollBar, wxScrollBar)
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EVT_SCROLL(AttachableScrollBar::OnScroll)
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END_EVENT_TABLE()
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AttachableScrollBar::AttachableScrollBar(
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wxWindow* parent,
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wxWindowID id,
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const wxPoint& pos,
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const wxSize& size,
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long style) :
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wxScrollBar( parent, id, pos, size, style )
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{
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mpViewInfo = NULL;
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}
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AttachableScrollBar::~AttachableScrollBar(void)
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{
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}
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// Essentially a float to int conversion.
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void AttachableScrollBar::SetScrollBarFromViewInfo()
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{
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ViewInfo & mViewInfo = *mpViewInfo;
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mViewInfo.sbarTotal = (int) (mViewInfo.total * mViewInfo.zoom);
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mViewInfo.sbarScreen = (int) (mViewInfo.screen * mViewInfo.zoom);
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mViewInfo.sbarH = (int) (mViewInfo.h * mViewInfo.zoom);
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SetScrollbar(mViewInfo.sbarH, mViewInfo.sbarScreen,
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mViewInfo.sbarTotal, mViewInfo.sbarScreen, TRUE);
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mViewInfo.lastZoom = mViewInfo.zoom;
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}
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// Essentially an int to float conversion.
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void AttachableScrollBar::SetViewInfoFromScrollBar()
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{
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ViewInfo & mViewInfo = *mpViewInfo;
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int hlast = mViewInfo.sbarH;
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int hoffset = 0;
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mViewInfo.sbarH = GetThumbPosition();
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if (mViewInfo.sbarH != hlast) {
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mViewInfo.h = mViewInfo.sbarH / mViewInfo.zoom;
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if (mViewInfo.h > mViewInfo.total - mViewInfo.screen)
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mViewInfo.h = mViewInfo.total - mViewInfo.screen;
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if (mViewInfo.h < 0.0)
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mViewInfo.h = 0.0;
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hoffset = (mViewInfo.sbarH - hlast);
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}
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}
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// Used to associated a ViewInfo structure with a scrollbar.
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void AttachableScrollBar::SetViewInfo( ViewInfo * view )
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{
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mpViewInfo = view;
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SetScrollBarFromViewInfo();
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}
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void AttachableScrollBar::OnScroll(wxScrollEvent & event)
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{
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if( mpViewInfo == NULL )
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{
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event.Skip();
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return;
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}
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SetViewInfoFromScrollBar();
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event.Skip(); // This is so that the parent control can refresh whatever it needs to...
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}
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// Indentation settings for Vim and Emacs
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// Please do not modify past this point.
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//
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// Local Variables:
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// c-basic-offset: 3
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// indent-tabs-mode: nil
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// End:
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