michael@0: 
michael@0: /*
michael@0:  * Copyright 2011 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: #include "SkScrollBarView.h"
michael@0: #include "SkAnimator.h"
michael@0: #include "SkWidgetViews.h"
michael@0: #include "SkSystemEventTypes.h"
michael@0: #include "SkTime.h"
michael@0: 
michael@0: //see SkProgressBarView.cpp
michael@0: //#include "SkWidgetViews.cpp"
michael@0: 
michael@0: SkScrollBarView::SkScrollBarView()
michael@0: {
michael@0:     fAnim.setHostEventSink(this);
michael@0:     init_skin_anim(kScroll_SkinEnum, &fAnim);
michael@0: 
michael@0:     fTotalLength = 0;
michael@0:     fStartPoint = 0;
michael@0:     fShownLength = 0;
michael@0: 
michael@0:     this->adjust();
michael@0: }
michael@0: 
michael@0: void SkScrollBarView::setStart(unsigned start)
michael@0: {
michael@0:     if ((int)start < 0)
michael@0:         start = 0;
michael@0: 
michael@0:     if (fStartPoint != start)
michael@0:     {
michael@0:         fStartPoint = start;
michael@0:         this->adjust();
michael@0:     }
michael@0: }
michael@0: 
michael@0: void SkScrollBarView::setShown(unsigned shown)
michael@0: {
michael@0:     if ((int)shown < 0)
michael@0:         shown = 0;
michael@0: 
michael@0:     if (fShownLength != shown)
michael@0:     {
michael@0:         fShownLength = shown;
michael@0:         this->adjust();
michael@0:     }
michael@0: }
michael@0: 
michael@0: void SkScrollBarView::setTotal(unsigned total)
michael@0: {
michael@0:     if ((int)total < 0)
michael@0:         total = 0;
michael@0: 
michael@0:     if (fTotalLength != total)
michael@0:     {
michael@0:         fTotalLength = total;
michael@0:         this->adjust();
michael@0:     }
michael@0: }
michael@0: 
michael@0: /* virtual */ void SkScrollBarView::onInflate(const SkDOM& dom, const SkDOM::Node* node)
michael@0: {
michael@0:     this->INHERITED::onInflate(dom, node);
michael@0: 
michael@0:     int32_t value;
michael@0:     if (dom.findS32(node, "total", &value))
michael@0:         this->setTotal(value);
michael@0:     if (dom.findS32(node, "shown", &value))
michael@0:         this->setShown(value);
michael@0: }
michael@0: 
michael@0: /*virtual*/ void SkScrollBarView::onSizeChange()
michael@0: {
michael@0:     this->INHERITED::onSizeChange();
michael@0:     SkEvent evt("user");
michael@0:     evt.setString("id", "setDim");
michael@0:     evt.setScalar("dimX", this->width());
michael@0:     evt.setScalar("dimY", this->height());
michael@0:     fAnim.doUserEvent(evt);
michael@0: }
michael@0: 
michael@0: /*virtual*/ void SkScrollBarView::onDraw(SkCanvas* canvas)
michael@0: {
michael@0:     SkPaint                        paint;
michael@0:     SkAnimator::DifferenceType    diff = fAnim.draw(canvas, &paint, SkTime::GetMSecs());
michael@0: 
michael@0:     if (diff == SkAnimator::kDifferent)
michael@0:         this->inval(NULL);
michael@0:     else if (diff == SkAnimator::kPartiallyDifferent)
michael@0:     {
michael@0:         SkRect    bounds;
michael@0:         fAnim.getInvalBounds(&bounds);
michael@0:         this->inval(&bounds);
michael@0:     }
michael@0: }
michael@0: 
michael@0: /*virtual*/ bool SkScrollBarView::onEvent(const SkEvent& evt)
michael@0: {
michael@0:     if (evt.isType(SK_EventType_Inval))
michael@0:     {
michael@0:         this->inval(NULL);
michael@0:         return true;
michael@0:     }
michael@0:     if (evt.isType("recommendDim"))
michael@0:     {
michael@0:         SkScalar    width;
michael@0: 
michael@0:         if (evt.findScalar("x", &width))
michael@0:             this->setWidth(width);
michael@0:         return true;
michael@0:     }
michael@0: 
michael@0:     return this->INHERITED::onEvent(evt);
michael@0: }
michael@0: 
michael@0: void SkScrollBarView::adjust()
michael@0: {
michael@0:     int total = fTotalLength;
michael@0:     int start = fStartPoint;
michael@0:     int shown = fShownLength;
michael@0: //    int hideBar = 0;
michael@0: 
michael@0:     if (total <= 0 || shown <= 0 || shown >= total)    // no bar to show
michael@0:     {
michael@0:         total = 1;        // avoid divide-by-zero. should be done by skin/script
michael@0: //        hideBar = 1;    // signal we don't want a thumb
michael@0:     }
michael@0:     else
michael@0:     {
michael@0:         if (start + shown > total)
michael@0:             start = total - shown;
michael@0:     }
michael@0: 
michael@0:     SkEvent e("user");
michael@0:     e.setString("id", "adjustScrollBar");
michael@0:     e.setScalar("_totalLength", SkIntToScalar(total));
michael@0:     e.setScalar("_startPoint", SkIntToScalar(start));
michael@0:     e.setScalar("_shownLength", SkIntToScalar(shown));
michael@0: //    e.setS32("hideBar", hideBar);
michael@0:     fAnim.doUserEvent(e);
michael@0: }