This source file includes following definitions.
- create
- m_dragAndDropAutoscrollStartTime
- autoscrollInProgress
- autoscrollInProgress
- startAutoscrollForSelection
- stopAutoscroll
- stopAutoscrollIfNeeded
- updateAutoscrollRenderer
- updateDragAndDrop
- handleMouseReleaseForPanScrolling
- panScrollInProgress
- startPanScrolling
- panScrollInProgress
- animate
- startAutoscroll
- updatePanScrollState
#include "config.h"
#include "core/page/AutoscrollController.h"
#include "core/frame/FrameView.h"
#include "core/frame/LocalFrame.h"
#include "core/page/Chrome.h"
#include "core/page/EventHandler.h"
#include "core/page/Page.h"
#include "core/rendering/HitTestResult.h"
#include "core/rendering/RenderBox.h"
#include "core/rendering/RenderListBox.h"
#include "wtf/CurrentTime.h"
namespace WebCore {
static double autoscrollDelay = 0.2;
PassOwnPtr<AutoscrollController> AutoscrollController::create(Page& page)
{
return adoptPtr(new AutoscrollController(page));
}
AutoscrollController::AutoscrollController(Page& page)
: m_page(page)
, m_autoscrollRenderer(0)
, m_autoscrollType(NoAutoscroll)
, m_dragAndDropAutoscrollStartTime(0)
{
}
bool AutoscrollController::autoscrollInProgress() const
{
return m_autoscrollType == AutoscrollForSelection;
}
bool AutoscrollController::autoscrollInProgress(const RenderBox* renderer) const
{
return m_autoscrollRenderer == renderer;
}
void AutoscrollController::startAutoscrollForSelection(RenderObject* renderer)
{
if (m_autoscrollType != NoAutoscroll)
return;
RenderBox* scrollable = RenderBox::findAutoscrollable(renderer);
if (!scrollable)
scrollable = renderer->isListBox() ? toRenderListBox(renderer) : 0;
if (!scrollable)
return;
m_autoscrollType = AutoscrollForSelection;
m_autoscrollRenderer = scrollable;
startAutoscroll();
}
void AutoscrollController::stopAutoscroll()
{
RenderBox* scrollable = m_autoscrollRenderer;
m_autoscrollRenderer = 0;
if (!scrollable)
return;
scrollable->stopAutoscroll();
#if OS(WIN)
if (panScrollInProgress()) {
if (FrameView* view = scrollable->frame()->view()) {
view->removePanScrollIcon();
view->setCursor(pointerCursor());
}
}
#endif
m_autoscrollType = NoAutoscroll;
}
void AutoscrollController::stopAutoscrollIfNeeded(RenderObject* renderer)
{
if (m_autoscrollRenderer != renderer)
return;
m_autoscrollRenderer = 0;
m_autoscrollType = NoAutoscroll;
}
void AutoscrollController::updateAutoscrollRenderer()
{
if (!m_autoscrollRenderer)
return;
RenderObject* renderer = m_autoscrollRenderer;
#if OS(WIN)
HitTestResult hitTest = renderer->frame()->eventHandler().hitTestResultAtPoint(m_panScrollStartPos, HitTestRequest::ReadOnly | HitTestRequest::Active | HitTestRequest::ConfusingAndOftenMisusedDisallowShadowContent);
if (Node* nodeAtPoint = hitTest.innerNode())
renderer = nodeAtPoint->renderer();
#endif
while (renderer && !(renderer->isBox() && toRenderBox(renderer)->canAutoscroll()))
renderer = renderer->parent();
m_autoscrollRenderer = renderer && renderer->isBox() ? toRenderBox(renderer) : 0;
}
void AutoscrollController::updateDragAndDrop(Node* dropTargetNode, const IntPoint& eventPosition, double eventTime)
{
if (!dropTargetNode || !dropTargetNode->renderer()) {
stopAutoscroll();
return;
}
if (m_autoscrollRenderer && m_autoscrollRenderer->frame() != dropTargetNode->renderer()->frame())
return;
RenderBox* scrollable = RenderBox::findAutoscrollable(dropTargetNode->renderer());
if (!scrollable) {
stopAutoscroll();
return;
}
Page* page = scrollable->frame() ? scrollable->frame()->page() : 0;
if (!page) {
stopAutoscroll();
return;
}
IntSize offset = scrollable->calculateAutoscrollDirection(eventPosition);
if (offset.isZero()) {
stopAutoscroll();
return;
}
m_dragAndDropAutoscrollReferencePosition = eventPosition + offset;
if (m_autoscrollType == NoAutoscroll) {
m_autoscrollType = AutoscrollForDragAndDrop;
m_autoscrollRenderer = scrollable;
m_dragAndDropAutoscrollStartTime = eventTime;
startAutoscroll();
} else if (m_autoscrollRenderer != scrollable) {
m_dragAndDropAutoscrollStartTime = eventTime;
m_autoscrollRenderer = scrollable;
}
}
#if OS(WIN)
void AutoscrollController::handleMouseReleaseForPanScrolling(LocalFrame* frame, const PlatformMouseEvent& mouseEvent)
{
if (!frame->isMainFrame())
return;
switch (m_autoscrollType) {
case AutoscrollForPan:
if (mouseEvent.button() == MiddleButton)
m_autoscrollType = AutoscrollForPanCanStop;
break;
case AutoscrollForPanCanStop:
stopAutoscroll();
break;
}
}
bool AutoscrollController::panScrollInProgress() const
{
return m_autoscrollType == AutoscrollForPanCanStop || m_autoscrollType == AutoscrollForPan;
}
void AutoscrollController::startPanScrolling(RenderBox* scrollable, const IntPoint& lastKnownMousePosition)
{
if (m_autoscrollType != NoAutoscroll)
return;
m_autoscrollType = AutoscrollForPan;
m_autoscrollRenderer = scrollable;
m_panScrollStartPos = lastKnownMousePosition;
if (FrameView* view = scrollable->frame()->view())
view->addPanScrollIcon(lastKnownMousePosition);
startAutoscroll();
}
#else
bool AutoscrollController::panScrollInProgress() const
{
return false;
}
#endif
void AutoscrollController::animate(double)
{
if (!m_autoscrollRenderer) {
stopAutoscroll();
return;
}
EventHandler& eventHandler = m_autoscrollRenderer->frame()->eventHandler();
switch (m_autoscrollType) {
case AutoscrollForDragAndDrop:
if (WTF::currentTime() - m_dragAndDropAutoscrollStartTime > autoscrollDelay)
m_autoscrollRenderer->autoscroll(m_dragAndDropAutoscrollReferencePosition);
break;
case AutoscrollForSelection:
if (!eventHandler.mousePressed()) {
stopAutoscroll();
return;
}
eventHandler.updateSelectionForMouseDrag();
m_autoscrollRenderer->autoscroll(eventHandler.lastKnownMousePosition());
break;
case NoAutoscroll:
break;
#if OS(WIN)
case AutoscrollForPanCanStop:
case AutoscrollForPan:
if (!panScrollInProgress()) {
stopAutoscroll();
return;
}
if (FrameView* view = m_autoscrollRenderer->frame()->view())
updatePanScrollState(view, eventHandler.lastKnownMousePosition());
m_autoscrollRenderer->panScroll(m_panScrollStartPos);
break;
#endif
}
if (m_autoscrollType != NoAutoscroll)
m_page.chrome().scheduleAnimation();
}
void AutoscrollController::startAutoscroll()
{
m_page.chrome().scheduleAnimation();
}
#if OS(WIN)
void AutoscrollController::updatePanScrollState(FrameView* view, const IntPoint& lastKnownMousePosition)
{
bool east = m_panScrollStartPos.x() < (lastKnownMousePosition.x() - ScrollView::noPanScrollRadius);
bool west = m_panScrollStartPos.x() > (lastKnownMousePosition.x() + ScrollView::noPanScrollRadius);
bool north = m_panScrollStartPos.y() > (lastKnownMousePosition.y() + ScrollView::noPanScrollRadius);
bool south = m_panScrollStartPos.y() < (lastKnownMousePosition.y() - ScrollView::noPanScrollRadius);
if (m_autoscrollType == AutoscrollForPan && (east || west || north || south))
m_autoscrollType = AutoscrollForPanCanStop;
if (north) {
if (east)
view->setCursor(northEastPanningCursor());
else if (west)
view->setCursor(northWestPanningCursor());
else
view->setCursor(northPanningCursor());
} else if (south) {
if (east)
view->setCursor(southEastPanningCursor());
else if (west)
view->setCursor(southWestPanningCursor());
else
view->setCursor(southPanningCursor());
} else if (east)
view->setCursor(eastPanningCursor());
else if (west)
view->setCursor(westPanningCursor());
else
view->setCursor(middlePanningCursor());
}
#endif
}