Squashed TODO in Chart::_UpdateScrollBar(): We set both scroll bar range and

value -- make sure to ignore feedback when setting the range (happens when the
old value doesn't fit the range anymore). Fixes unexpected jumps when zooming
out.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@30666 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/apps/debuganalyzer/gui/chart/Chart.cpp

@@ -65,6 +65,7 @@ Chart::Chart(ChartRenderer* renderer, const char* name)
 	fVScrollSize(0),
 	fHScrollValue(0),
 	fVScrollValue(0),
+	fIgnoreScrollEvent(0),
 	fDomainZoomLimit(0),
 	fLastMousePos(-1, -1),
 	fDraggingStartPos(-1, -1)
@@ -407,6 +408,9 @@ printf("Chart::Draw((%f, %f) - (%f, %f))\n", updateRect.left, updateRect.top, up
 void
 Chart::ScrollTo(BPoint where)
 {
+	if (fIgnoreScrollEvent > 0)
+		return;
+
 	_ScrollTo(where.x, true);
 	_ScrollTo(where.y, false);
 }
@@ -531,8 +535,9 @@ Chart::_UpdateScrollBar(bool horizontal)
 	}
 
 	if (scrollBar != NULL) {
+		fIgnoreScrollEvent++;
 		scrollBar->SetRange(0, scrollSize);
-// TODO: If the scroll range changes, we might need to reset the scroll value.
+		fIgnoreScrollEvent--;
 		scrollBar->SetValue(scrollValue);
 		scrollBar->SetProportion(proportion);
 	}

src/apps/debuganalyzer/gui/chart/Chart.h

@@ -107,6 +107,7 @@ private:
 			float				fVScrollSize;
 			float				fHScrollValue;
 			float				fVScrollValue;
+			int32				fIgnoreScrollEvent;
 			double				fDomainZoomLimit;
 			BPoint				fLastMousePos;
 			BPoint				fDraggingStartPos;