grab from latest android

git-svn-id: http://skia.googlecode.com/svn/trunk@27 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 139 insertions, 0 deletions

diff --git a/src/views/SkScrollBarView.cpp b/src/views/SkScrollBarView.cpp
new file mode 100644
index 0000000000..2e087bd1ae
--- /dev/null
+++ b/src/views/SkScrollBarView.cpp
@@ -0,0 +1,139 @@
+#include "SkScrollBarView.h"
+#include "SkAnimator.h"
+#include "SkWidgetViews.h"
+#include "SkSystemEventTypes.h"
+#include "SkTime.h"
+
+//see SkProgressBarView.cpp
+//#include "SkWidgetViews.cpp"
+
+SkScrollBarView::SkScrollBarView()
+{
+	fAnim.setHostEventSink(this);
+	init_skin_anim(kScroll_SkinEnum, &fAnim);
+
+	fTotalLength = 0;
+	fStartPoint = 0;
+	fShownLength = 0;
+
+	this->adjust();
+}
+
+void SkScrollBarView::setStart(unsigned start)
+{
+	if ((int)start < 0)
+		start = 0;
+	
+	if (fStartPoint != start)
+	{
+		fStartPoint = start;
+		this->adjust();
+	}
+}
+
+void SkScrollBarView::setShown(unsigned shown)
+{
+	if ((int)shown < 0)
+		shown = 0;
+
+	if (fShownLength != shown)
+	{
+		fShownLength = shown;
+		this->adjust();
+	}
+}
+
+void SkScrollBarView::setTotal(unsigned total)
+{
+	if ((int)total < 0)
+		total = 0;
+
+	if (fTotalLength != total)
+	{
+		fTotalLength = total;
+		this->adjust();
+	}
+}
+
+/* virtual */ void SkScrollBarView::onInflate(const SkDOM& dom, const SkDOM::Node* node)
+{
+	this->INHERITED::onInflate(dom, node);
+	
+	int32_t value;
+	if (dom.findS32(node, "total", &value))
+		this->setTotal(value);
+	if (dom.findS32(node, "shown", &value))
+		this->setShown(value);
+}
+
+/*virtual*/ void SkScrollBarView::onSizeChange()
+{
+	this->INHERITED::onSizeChange();
+	SkEvent evt("user");
+	evt.setString("id", "setDim");
+	evt.setScalar("dimX", this->width());
+	evt.setScalar("dimY", this->height());
+	fAnim.doUserEvent(evt);
+}
+
+/*virtual*/ void SkScrollBarView::onDraw(SkCanvas* canvas)
+{
+	SkPaint						paint;		
+	SkAnimator::DifferenceType	diff = fAnim.draw(canvas, &paint, SkTime::GetMSecs());
+	
+	if (diff == SkAnimator::kDifferent)
+		this->inval(NULL);
+	else if (diff == SkAnimator::kPartiallyDifferent)
+	{
+		SkRect	bounds;
+		fAnim.getInvalBounds(&bounds);
+		this->inval(&bounds);
+	}
+}
+
+/*virtual*/ bool SkScrollBarView::onEvent(const SkEvent& evt)
+{
+	if (evt.isType(SK_EventType_Inval))
+	{
+		this->inval(NULL);
+		return true;
+	}
+	if (evt.isType("recommendDim"))
+	{
+		SkScalar	width;
+		
+		if (evt.findScalar("x", &width))
+			this->setWidth(width);
+		return true;
+	}
+
+	return this->INHERITED::onEvent(evt);
+}
+
+void SkScrollBarView::adjust()
+{
+	int total = fTotalLength;
+	int start = fStartPoint;
+	int shown = fShownLength;
+	int hideBar = 0;
+	
+	if (total <= 0 || shown <= 0 || shown >= total)	// no bar to show
+	{
+		total = 1;		// avoid divide-by-zero. should be done by skin/script
+		hideBar = 1;	// signal we don't want a thumb
+	}
+	else
+	{
+		if (start + shown > total)
+			start = total - shown;
+	}
+	
+	SkEvent e("user");
+	e.setString("id", "adjustScrollBar");
+	e.setScalar("_totalLength", SkIntToScalar(total));
+	e.setScalar("_startPoint", SkIntToScalar(start));
+	e.setScalar("_shownLength", SkIntToScalar(shown));
+//	e.setS32("hideBar", hideBar);
+	fAnim.doUserEvent(e);
+}
+