| /* |
| * Copyright (C) 2013 Google Inc. All rights reserved. |
| * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved. |
| * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org) |
| * Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies) |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "core/page/AutoscrollController.h" |
| |
| #include "core/page/EventHandler.h" |
| #include "core/frame/Frame.h" |
| #include "core/frame/FrameView.h" |
| #include "core/page/Chrome.h" |
| #include "core/page/Page.h" |
| #include "core/rendering/HitTestResult.h" |
| #include "core/rendering/RenderBox.h" |
| #include "wtf/CurrentTime.h" |
| |
| namespace WebCore { |
| |
| // Delay time in second for start autoscroll if pointer is in border edge of scrollable element. |
| 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) |
| { |
| // We don't want to trigger the autoscroll or the panScroll if it's already active |
| if (m_autoscrollType != NoAutoscroll) |
| return; |
| RenderBox* scrollable = RenderBox::findAutoscrollable(renderer); |
| 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(Frame* 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) |
| { |
| // We don't want to trigger the autoscroll or the panScroll if it's already active |
| 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 |
| |
| // FIXME: This would get get better animation fidelity if it used the monotonicFrameBeginTime instead |
| // of WTF::currentTime(). |
| 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) |
| { |
| // At the original click location we draw a 4 arrowed icon. Over this icon there won't be any scroll |
| // So we don't want to change the cursor over this area |
| 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 |
| |
| } // namespace WebCore |