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-rw-r--r--widget/windows/nsWinGesture.cpp388
1 files changed, 388 insertions, 0 deletions
diff --git a/widget/windows/nsWinGesture.cpp b/widget/windows/nsWinGesture.cpp
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+++ b/widget/windows/nsWinGesture.cpp
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * nsWinGesture - Touch input handling for tablet displays.
+ */
+
+#include "nscore.h"
+#include "nsWinGesture.h"
+#include "nsUXThemeData.h"
+#include "mozilla/Logging.h"
+#include "mozilla/MouseEvents.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/TouchEvents.h"
+#include "mozilla/dom/SimpleGestureEventBinding.h"
+#include "mozilla/dom/WheelEventBinding.h"
+
+#include <cmath>
+
+using namespace mozilla;
+using namespace mozilla::widget;
+
+extern mozilla::LazyLogModule gWindowsLog;
+
+static bool gEnableSingleFingerPanEvents = false;
+
+nsWinGesture::nsWinGesture()
+ : mPanActive(false),
+ mFeedbackActive(false),
+ mXAxisFeedback(false),
+ mYAxisFeedback(false),
+ mPanInertiaActive(false) {
+ (void)InitLibrary();
+ mPixelScrollOverflow = 0;
+}
+
+/* Load and shutdown */
+
+bool nsWinGesture::InitLibrary() {
+ // Check to see if we want single finger gesture input. Only do this once
+ // for the app so we don't have to look it up on every window create.
+ gEnableSingleFingerPanEvents =
+ Preferences::GetBool("gestures.enable_single_finger_input", false);
+
+ return true;
+}
+
+#define GCOUNT 5
+
+bool nsWinGesture::SetWinGestureSupport(
+ HWND hWnd, WidgetGestureNotifyEvent::PanDirection aDirection) {
+ GESTURECONFIG config[GCOUNT];
+
+ memset(&config, 0, sizeof(config));
+
+ config[0].dwID = GID_ZOOM;
+ config[0].dwWant = GC_ZOOM;
+ config[0].dwBlock = 0;
+
+ config[1].dwID = GID_ROTATE;
+ config[1].dwWant = GC_ROTATE;
+ config[1].dwBlock = 0;
+
+ config[2].dwID = GID_PAN;
+ config[2].dwWant = GC_PAN | GC_PAN_WITH_INERTIA | GC_PAN_WITH_GUTTER;
+ config[2].dwBlock = GC_PAN_WITH_SINGLE_FINGER_VERTICALLY |
+ GC_PAN_WITH_SINGLE_FINGER_HORIZONTALLY;
+
+ if (gEnableSingleFingerPanEvents) {
+ if (aDirection == WidgetGestureNotifyEvent::ePanVertical ||
+ aDirection == WidgetGestureNotifyEvent::ePanBoth) {
+ config[2].dwWant |= GC_PAN_WITH_SINGLE_FINGER_VERTICALLY;
+ config[2].dwBlock -= GC_PAN_WITH_SINGLE_FINGER_VERTICALLY;
+ }
+
+ if (aDirection == WidgetGestureNotifyEvent::ePanHorizontal ||
+ aDirection == WidgetGestureNotifyEvent::ePanBoth) {
+ config[2].dwWant |= GC_PAN_WITH_SINGLE_FINGER_HORIZONTALLY;
+ config[2].dwBlock -= GC_PAN_WITH_SINGLE_FINGER_HORIZONTALLY;
+ }
+ }
+
+ config[3].dwWant = GC_TWOFINGERTAP;
+ config[3].dwID = GID_TWOFINGERTAP;
+ config[3].dwBlock = 0;
+
+ config[4].dwWant = GC_PRESSANDTAP;
+ config[4].dwID = GID_PRESSANDTAP;
+ config[4].dwBlock = 0;
+
+ return SetGestureConfig(hWnd, 0, GCOUNT, (PGESTURECONFIG)&config,
+ sizeof(GESTURECONFIG));
+}
+
+/* Helpers */
+
+bool nsWinGesture::IsPanEvent(LPARAM lParam) {
+ GESTUREINFO gi;
+
+ ZeroMemory(&gi, sizeof(GESTUREINFO));
+ gi.cbSize = sizeof(GESTUREINFO);
+
+ BOOL result = GetGestureInfo((HGESTUREINFO)lParam, &gi);
+ if (!result) return false;
+
+ if (gi.dwID == GID_PAN) return true;
+
+ return false;
+}
+
+/* Gesture event processing */
+
+bool nsWinGesture::ProcessGestureMessage(HWND hWnd, WPARAM wParam,
+ LPARAM lParam,
+ WidgetSimpleGestureEvent& evt) {
+ GESTUREINFO gi;
+
+ ZeroMemory(&gi, sizeof(GESTUREINFO));
+ gi.cbSize = sizeof(GESTUREINFO);
+
+ BOOL result = GetGestureInfo((HGESTUREINFO)lParam, &gi);
+ if (!result) return false;
+
+ // The coordinates of this event
+ nsPointWin coord;
+ coord = gi.ptsLocation;
+ coord.ScreenToClient(hWnd);
+
+ evt.mRefPoint = LayoutDeviceIntPoint(coord.x, coord.y);
+
+ // Multiple gesture can occur at the same time so gesture state
+ // info can't be shared.
+ switch (gi.dwID) {
+ case GID_BEGIN:
+ case GID_END:
+ // These should always fall through to DefWndProc
+ return false;
+ break;
+
+ case GID_ZOOM: {
+ if (gi.dwFlags & GF_BEGIN) {
+ // Send a zoom start event
+
+ // The low 32 bits are the distance in pixels.
+ mZoomIntermediate = (float)gi.ullArguments;
+
+ evt.mMessage = eMagnifyGestureStart;
+ evt.mDelta = 0.0;
+ } else if (gi.dwFlags & GF_END) {
+ // Send a zoom end event, the delta is the change
+ // in touch points.
+ evt.mMessage = eMagnifyGesture;
+ // (positive for a "zoom in")
+ evt.mDelta = -1.0 * (mZoomIntermediate - (float)gi.ullArguments);
+ mZoomIntermediate = (float)gi.ullArguments;
+ } else {
+ // Send a zoom intermediate event, the delta is the change
+ // in touch points.
+ evt.mMessage = eMagnifyGestureUpdate;
+ // (positive for a "zoom in")
+ evt.mDelta = -1.0 * (mZoomIntermediate - (float)gi.ullArguments);
+ mZoomIntermediate = (float)gi.ullArguments;
+ }
+ } break;
+
+ case GID_ROTATE: {
+ // Send a rotate start event
+ double radians = 0.0;
+
+ // On GF_BEGIN, ullArguments contains the absolute rotation at the
+ // start of the gesture. In later events it contains the offset from
+ // the start angle.
+ if (gi.ullArguments != 0)
+ radians = GID_ROTATE_ANGLE_FROM_ARGUMENT(gi.ullArguments);
+
+ double degrees = -1 * radians * (180 / M_PI);
+
+ if (gi.dwFlags & GF_BEGIN) {
+ // At some point we should pass the initial angle in
+ // along with delta. It's useful.
+ degrees = mRotateIntermediate = 0.0;
+ }
+
+ evt.mDirection = 0;
+ evt.mDelta = degrees - mRotateIntermediate;
+ mRotateIntermediate = degrees;
+
+ if (evt.mDelta > 0) {
+ evt.mDirection =
+ dom::SimpleGestureEvent_Binding::ROTATION_COUNTERCLOCKWISE;
+ } else if (evt.mDelta < 0) {
+ evt.mDirection = dom::SimpleGestureEvent_Binding::ROTATION_CLOCKWISE;
+ }
+
+ if (gi.dwFlags & GF_BEGIN) {
+ evt.mMessage = eRotateGestureStart;
+ } else if (gi.dwFlags & GF_END) {
+ evt.mMessage = eRotateGesture;
+ } else {
+ evt.mMessage = eRotateGestureUpdate;
+ }
+ } break;
+
+ case GID_TWOFINGERTAP:
+ // Normally maps to "restore" from whatever you may have recently changed.
+ // A simple double click.
+ evt.mMessage = eTapGesture;
+ evt.mClickCount = 1;
+ break;
+
+ case GID_PRESSANDTAP:
+ // Two finger right click. Defaults to right click if it falls through.
+ evt.mMessage = ePressTapGesture;
+ evt.mClickCount = 1;
+ break;
+ }
+
+ return true;
+}
+
+bool nsWinGesture::ProcessPanMessage(HWND hWnd, WPARAM wParam, LPARAM lParam) {
+ GESTUREINFO gi;
+
+ ZeroMemory(&gi, sizeof(GESTUREINFO));
+ gi.cbSize = sizeof(GESTUREINFO);
+
+ BOOL result = GetGestureInfo((HGESTUREINFO)lParam, &gi);
+ if (!result) return false;
+
+ // The coordinates of this event
+ nsPointWin coord;
+ coord = mPanRefPoint = gi.ptsLocation;
+ // We want screen coordinates in our local offsets as client coordinates will
+ // change when feedback is taking place. Gui events though require client
+ // coordinates.
+ mPanRefPoint.ScreenToClient(hWnd);
+
+ switch (gi.dwID) {
+ case GID_BEGIN:
+ case GID_END:
+ // These should always fall through to DefWndProc
+ return false;
+ break;
+
+ // Setup pixel scroll events for both axis
+ case GID_PAN: {
+ if (gi.dwFlags & GF_BEGIN) {
+ mPanIntermediate = coord;
+ mPixelScrollDelta = 0;
+ mPanActive = true;
+ mPanInertiaActive = false;
+ } else {
+#ifdef DBG_jimm
+ int32_t deltaX = mPanIntermediate.x - coord.x;
+ int32_t deltaY = mPanIntermediate.y - coord.y;
+ MOZ_LOG(gWindowsLog, LogLevel::Info,
+ ("coordX=%d coordY=%d deltaX=%d deltaY=%d x:%d y:%d\n", coord.x,
+ coord.y, deltaX, deltaY, mXAxisFeedback, mYAxisFeedback));
+#endif
+
+ mPixelScrollDelta.x = mPanIntermediate.x - coord.x;
+ mPixelScrollDelta.y = mPanIntermediate.y - coord.y;
+ mPanIntermediate = coord;
+
+ if (gi.dwFlags & GF_INERTIA) mPanInertiaActive = true;
+
+ if (gi.dwFlags & GF_END) {
+ mPanActive = false;
+ mPanInertiaActive = false;
+ PanFeedbackFinalize(hWnd, true);
+ }
+ }
+ } break;
+ }
+ return true;
+}
+
+inline bool TestTransition(int32_t a, int32_t b) {
+ // If a is zero, overflow is zero, implying the cursor has moved back to the
+ // start position. If b is zero, cached overscroll is zero, implying feedback
+ // just begun.
+ if (a == 0 || b == 0) return true;
+ // Test for different signs.
+ return (a < 0) == (b < 0);
+}
+
+void nsWinGesture::UpdatePanFeedbackX(HWND hWnd, int32_t scrollOverflow,
+ bool& endFeedback) {
+ // If scroll overflow was returned indicating we panned past the bounds of
+ // the scrollable view port, start feeback.
+ if (scrollOverflow != 0) {
+ if (!mFeedbackActive) {
+ BeginPanningFeedback(hWnd);
+ mFeedbackActive = true;
+ }
+ endFeedback = false;
+ mXAxisFeedback = true;
+ return;
+ }
+
+ if (mXAxisFeedback) {
+ int32_t newOverflow = mPixelScrollOverflow.x - mPixelScrollDelta.x;
+
+ // Detect a reverse transition past the starting drag point. This tells us
+ // the user has panned all the way back so we can stop providing feedback
+ // for this axis.
+ if (!TestTransition(newOverflow, mPixelScrollOverflow.x) ||
+ newOverflow == 0)
+ return;
+
+ // Cache the total over scroll in pixels.
+ mPixelScrollOverflow.x = newOverflow;
+ endFeedback = false;
+ }
+}
+
+void nsWinGesture::UpdatePanFeedbackY(HWND hWnd, int32_t scrollOverflow,
+ bool& endFeedback) {
+ // If scroll overflow was returned indicating we panned past the bounds of
+ // the scrollable view port, start feeback.
+ if (scrollOverflow != 0) {
+ if (!mFeedbackActive) {
+ BeginPanningFeedback(hWnd);
+ mFeedbackActive = true;
+ }
+ endFeedback = false;
+ mYAxisFeedback = true;
+ return;
+ }
+
+ if (mYAxisFeedback) {
+ int32_t newOverflow = mPixelScrollOverflow.y - mPixelScrollDelta.y;
+
+ // Detect a reverse transition past the starting drag point. This tells us
+ // the user has panned all the way back so we can stop providing feedback
+ // for this axis.
+ if (!TestTransition(newOverflow, mPixelScrollOverflow.y) ||
+ newOverflow == 0)
+ return;
+
+ // Cache the total over scroll in pixels.
+ mPixelScrollOverflow.y = newOverflow;
+ endFeedback = false;
+ }
+}
+
+void nsWinGesture::PanFeedbackFinalize(HWND hWnd, bool endFeedback) {
+ if (!mFeedbackActive) return;
+
+ if (endFeedback) {
+ mFeedbackActive = false;
+ mXAxisFeedback = false;
+ mYAxisFeedback = false;
+ mPixelScrollOverflow = 0;
+ EndPanningFeedback(hWnd, TRUE);
+ return;
+ }
+
+ UpdatePanningFeedback(hWnd, mPixelScrollOverflow.x, mPixelScrollOverflow.y,
+ mPanInertiaActive);
+}
+
+bool nsWinGesture::PanDeltaToPixelScroll(WidgetWheelEvent& aWheelEvent) {
+ aWheelEvent.mDeltaX = aWheelEvent.mDeltaY = aWheelEvent.mDeltaZ = 0.0;
+ aWheelEvent.mLineOrPageDeltaX = aWheelEvent.mLineOrPageDeltaY = 0;
+
+ aWheelEvent.mRefPoint = LayoutDeviceIntPoint(mPanRefPoint.x, mPanRefPoint.y);
+ aWheelEvent.mDeltaMode = dom::WheelEvent_Binding::DOM_DELTA_PIXEL;
+ aWheelEvent.mScrollType = WidgetWheelEvent::SCROLL_SYNCHRONOUSLY;
+ aWheelEvent.mIsNoLineOrPageDelta = true;
+
+ aWheelEvent.mOverflowDeltaX = 0.0;
+ aWheelEvent.mOverflowDeltaY = 0.0;
+
+ // Don't scroll the view if we are currently at a bounds, or, if we are
+ // panning back from a max feedback position. This keeps the original drag
+ // point constant.
+ if (!mXAxisFeedback) {
+ aWheelEvent.mDeltaX = mPixelScrollDelta.x;
+ }
+ if (!mYAxisFeedback) {
+ aWheelEvent.mDeltaY = mPixelScrollDelta.y;
+ }
+
+ return (aWheelEvent.mDeltaX != 0 || aWheelEvent.mDeltaY != 0);
+}