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Unified Diff: content/browser/renderer_host/web_input_event_factory_gtk.cc

Issue 19776016: Add files. Does not compile yet! (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: gtk links, may not work correctly Created 7 years, 5 months ago
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Index: content/browser/renderer_host/web_input_event_factory_gtk.cc
diff --git a/content/browser/renderer_host/web_input_event_factory_gtk.cc b/content/browser/renderer_host/web_input_event_factory_gtk.cc
new file mode 100644
index 0000000000000000000000000000000000000000..5f59d450bd013dde026967f61f84ec482ca2a6e0
--- /dev/null
+++ b/content/browser/renderer_host/web_input_event_factory_gtk.cc
@@ -0,0 +1,606 @@
+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/browser/renderer_host/web_input_event_factory_gtk.h"
+
+#include <gdk/gdk.h>
+#include <gdk/gdkkeysyms.h>
+#include <gtk/gtk.h>
+
+#include "base/logging.h"
+#include "third_party/WebKit/public/web/WebInputEvent.h"
+#include "ui/base/keycodes/keyboard_code_conversion_gtk.h"
+#include "ui/base/keycodes/keyboard_code_conversion.h"
+
+using WebKit::WebInputEvent;
+using WebKit::WebMouseEvent;
+using WebKit::WebMouseWheelEvent;
+using WebKit::WebKeyboardEvent;
+
+namespace {
+
+// For click count tracking.
+static int num_clicks = 0;
+static GdkWindow* lack_click_event_window = 0;
+static gint last_click_time = 0;
+static gint last_click_x = 0;
+static gint last_click_y = 0;
+static WebMouseEvent::Button last_click_button = WebMouseEvent::ButtonNone;
+
+bool ShouldForgetPreviousClick(GdkWindow* window, gint time, gint x, gint y) {
+ static GtkSettings* settings = gtk_settings_get_default();
+
+ if (window != lack_click_event_window)
+ return true;
+
+ gint double_click_time = 250;
+ gint double_click_distance = 5;
+ g_object_get(G_OBJECT(settings),
+ "gtk-double-click-time",
+ &double_click_time,
+ "gtk-double-click-distance",
+ &double_click_distance,
+ NULL);
+ return (time - last_click_time) > double_click_time ||
+ abs(x - last_click_x) > double_click_distance ||
+ abs(y - last_click_y) > double_click_distance;
+}
+
+void ResetClickCountState() {
+ num_clicks = 0;
+ lack_click_event_window = 0;
+ last_click_time = 0;
+ last_click_x = 0;
+ last_click_y = 0;
+ last_click_button = WebKit::WebMouseEvent::ButtonNone;
+}
+
+bool IsKeyPadKeyval(guint keyval) {
+ // Keypad keyvals all fall into one range.
+ return keyval >= GDK_KP_Space && keyval <= GDK_KP_9;
+}
+
+double GdkEventTimeToWebEventTime(guint32 time) {
+ // Convert from time in ms to time in sec.
+ return time / 1000.0;
+}
+
+int GdkStateToWebEventModifiers(guint state) {
+ int modifiers = 0;
+ if (state & GDK_SHIFT_MASK)
+ modifiers |= WebInputEvent::ShiftKey;
+ if (state & GDK_CONTROL_MASK)
+ modifiers |= WebInputEvent::ControlKey;
+ if (state & GDK_MOD1_MASK)
+ modifiers |= WebInputEvent::AltKey;
+ if (state & GDK_META_MASK)
+ modifiers |= WebInputEvent::MetaKey;
+ if (state & GDK_BUTTON1_MASK)
+ modifiers |= WebInputEvent::LeftButtonDown;
+ if (state & GDK_BUTTON2_MASK)
+ modifiers |= WebInputEvent::MiddleButtonDown;
+ if (state & GDK_BUTTON3_MASK)
+ modifiers |= WebInputEvent::RightButtonDown;
+ if (state & GDK_LOCK_MASK)
+ modifiers |= WebInputEvent::CapsLockOn;
+ if (state & GDK_MOD2_MASK)
+ modifiers |= WebInputEvent::NumLockOn;
+ return modifiers;
+}
+
+ui::KeyboardCode GdkEventToWindowsKeyCode(const GdkEventKey* event) {
+ return ui::WindowsKeyCodeForGdkKeyCode(event->keyval);
+ /*
+ static const unsigned int hardwareCodeToGDKKeyval[] = {
+ 0, // 0x00:
+ 0, // 0x01:
+ 0, // 0x02:
+ 0, // 0x03:
+ 0, // 0x04:
+ 0, // 0x05:
+ 0, // 0x06:
+ 0, // 0x07:
+ 0, // 0x08:
+ 0, // 0x09: GDK_Escape
+ GDK_1, // 0x0A: GDK_1
+ GDK_2, // 0x0B: GDK_2
+ GDK_3, // 0x0C: GDK_3
+ GDK_4, // 0x0D: GDK_4
+ GDK_5, // 0x0E: GDK_5
+ GDK_6, // 0x0F: GDK_6
+ GDK_7, // 0x10: GDK_7
+ GDK_8, // 0x11: GDK_8
+ GDK_9, // 0x12: GDK_9
+ GDK_0, // 0x13: GDK_0
+ GDK_minus, // 0x14: GDK_minus
+ GDK_equal, // 0x15: GDK_equal
+ 0, // 0x16: GDK_BackSpace
+ 0, // 0x17: GDK_Tab
+ GDK_q, // 0x18: GDK_q
+ GDK_w, // 0x19: GDK_w
+ GDK_e, // 0x1A: GDK_e
+ GDK_r, // 0x1B: GDK_r
+ GDK_t, // 0x1C: GDK_t
+ GDK_y, // 0x1D: GDK_y
+ GDK_u, // 0x1E: GDK_u
+ GDK_i, // 0x1F: GDK_i
+ GDK_o, // 0x20: GDK_o
+ GDK_p, // 0x21: GDK_p
+ GDK_bracketleft, // 0x22: GDK_bracketleft
+ GDK_bracketright, // 0x23: GDK_bracketright
+ 0, // 0x24: GDK_Return
+ 0, // 0x25: GDK_Control_L
+ GDK_a, // 0x26: GDK_a
+ GDK_s, // 0x27: GDK_s
+ GDK_d, // 0x28: GDK_d
+ GDK_f, // 0x29: GDK_f
+ GDK_g, // 0x2A: GDK_g
+ GDK_h, // 0x2B: GDK_h
+ GDK_j, // 0x2C: GDK_j
+ GDK_k, // 0x2D: GDK_k
+ GDK_l, // 0x2E: GDK_l
+ GDK_semicolon, // 0x2F: GDK_semicolon
+ GDK_apostrophe, // 0x30: GDK_apostrophe
+ GDK_grave, // 0x31: GDK_grave
+ 0, // 0x32: GDK_Shift_L
+ GDK_backslash, // 0x33: GDK_backslash
+ GDK_z, // 0x34: GDK_z
+ GDK_x, // 0x35: GDK_x
+ GDK_c, // 0x36: GDK_c
+ GDK_v, // 0x37: GDK_v
+ GDK_b, // 0x38: GDK_b
+ GDK_n, // 0x39: GDK_n
+ GDK_m, // 0x3A: GDK_m
+ GDK_comma, // 0x3B: GDK_comma
+ GDK_period, // 0x3C: GDK_period
+ GDK_slash, // 0x3D: GDK_slash
+ 0, // 0x3E: GDK_Shift_R
+ 0, // 0x3F:
+ 0, // 0x40:
+ 0, // 0x41:
+ 0, // 0x42:
+ 0, // 0x43:
+ 0, // 0x44:
+ 0, // 0x45:
+ 0, // 0x46:
+ 0, // 0x47:
+ 0, // 0x48:
+ 0, // 0x49:
+ 0, // 0x4A:
+ 0, // 0x4B:
+ 0, // 0x4C:
+ 0, // 0x4D:
+ 0, // 0x4E:
+ 0, // 0x4F:
+ 0, // 0x50:
+ 0, // 0x51:
+ 0, // 0x52:
+ 0, // 0x53:
+ 0, // 0x54:
+ 0, // 0x55:
+ 0, // 0x56:
+ 0, // 0x57:
+ 0, // 0x58:
+ 0, // 0x59:
+ 0, // 0x5A:
+ 0, // 0x5B:
+ 0, // 0x5C:
+ 0, // 0x5D:
+ 0, // 0x5E:
+ 0, // 0x5F:
+ 0, // 0x60:
+ 0, // 0x61:
+ 0, // 0x62:
+ 0, // 0x63:
+ 0, // 0x64:
+ 0, // 0x65:
+ 0, // 0x66:
+ 0, // 0x67:
+ 0, // 0x68:
+ 0, // 0x69:
+ 0, // 0x6A:
+ 0, // 0x6B:
+ 0, // 0x6C:
+ 0, // 0x6D:
+ 0, // 0x6E:
+ 0, // 0x6F:
+ 0, // 0x70:
+ 0, // 0x71:
+ 0, // 0x72:
+ GDK_Super_L, // 0x73: GDK_Super_L
+ GDK_Super_R, // 0x74: GDK_Super_R
+ };
+
+ // |windowsKeyCode| has to include a valid virtual-key code even when we
+ // use non-US layouts, e.g. even when we type an 'A' key of a US keyboard
+ // on the Hebrew layout, |windowsKeyCode| should be VK_A.
+ // On the other hand, |event->keyval| value depends on the current
+ // GdkKeymap object, i.e. when we type an 'A' key of a US keyboard on
+ // the Hebrew layout, |event->keyval| becomes GDK_hebrew_shin and this
+ // WebCore::windowsKeyCodeForKeyEvent() call returns 0.
+ // To improve compatibilty with Windows, we use |event->hardware_keycode|
+ // for retrieving its Windows key-code for the keys when the
+ // WebCore::windowsKeyCodeForEvent() call returns 0.
+ // We shouldn't use |event->hardware_keycode| for keys that GdkKeymap
+ // objects cannot change because |event->hardware_keycode| doesn't change
+ // even when we change the layout options, e.g. when we swap a control
+ // key and a caps-lock key, GTK doesn't swap their
+ // |event->hardware_keycode| values but swap their |event->keyval| values.
+ int windowsKeyCode = WebCore::windowsKeyCodeForKeyEvent(event->keyval);
+ if (windowsKeyCode)
+ return windowsKeyCode;
+
+ const int tableSize =
+ sizeof(hardwareCodeToGDKKeyval) / sizeof(hardwareCodeToGDKKeyval[0]);
+ if (event->hardware_keycode < tableSize) {
+ int keyval = hardwareCodeToGDKKeyval[event->hardware_keycode];
+ if (keyval)
+ return WebCore::windowsKeyCodeForKeyEvent(keyval);
+ }
+
+ // This key is one that keyboard-layout drivers cannot change.
+ // Use |event->keyval| to retrieve its |windowsKeyCode| value.
+ return WebCore::windowsKeyCodeForKeyEvent(event->keyval);
+ */
+}
+
+// Normalizes event->state to make it Windows/Mac compatible. Since the way
+// of setting modifier mask on X is very different than Windows/Mac as shown
+// in http://crbug.com/127142#c8, the normalization is necessary.
+guint NormalizeEventState(const GdkEventKey* event) {
+ guint mask = 0;
+ switch (GdkEventToWindowsKeyCode(event)) {
+ case ui::VKEY_CONTROL:
+ case ui::VKEY_LCONTROL:
+ case ui::VKEY_RCONTROL:
+ mask = GDK_CONTROL_MASK;
+ break;
+ case ui::VKEY_SHIFT:
+ case ui::VKEY_LSHIFT:
+ case ui::VKEY_RSHIFT:
+ mask = GDK_SHIFT_MASK;
+ break;
+ case ui::VKEY_MENU:
+ case ui::VKEY_LMENU:
+ case ui::VKEY_RMENU:
+ mask = GDK_MOD1_MASK;
+ break;
+ case ui::VKEY_CAPITAL:
+ mask = GDK_LOCK_MASK;
+ break;
+ default:
+ return event->state;
+ }
+ if (event->type == GDK_KEY_PRESS)
+ return event->state | mask;
+ return event->state & ~mask;
+}
+
+// Gets the corresponding control character of a specified key code. See:
+// http://en.wikipedia.org/wiki/Control_characters
+// We emulate Windows behavior here.
+int GetControlCharacter(ui::KeyboardCode windows_key_code, bool shift) {
+ if (windows_key_code >= ui::VKEY_A && windows_key_code <= ui::VKEY_Z) {
+ // ctrl-A ~ ctrl-Z map to \x01 ~ \x1A
+ return windows_key_code - ui::VKEY_A + 1;
+ }
+ if (shift) {
+ // following graphics chars require shift key to input.
+ switch (windows_key_code) {
+ // ctrl-@ maps to \x00 (Null byte)
+ case ui::VKEY_2:
+ return 0;
+ // ctrl-^ maps to \x1E (Record separator, Information separator two)
+ case ui::VKEY_6:
+ return 0x1E;
+ // ctrl-_ maps to \x1F (Unit separator, Information separator one)
+ case ui::VKEY_OEM_MINUS:
+ return 0x1F;
+ // Returns 0 for all other keys to avoid inputting unexpected chars.
+ default:
+ return 0;
+ }
+ } else {
+ switch (windows_key_code) {
+ // ctrl-[ maps to \x1B (Escape)
+ case ui::VKEY_OEM_4:
+ return 0x1B;
+ // ctrl-\ maps to \x1C (File separator, Information separator four)
+ case ui::VKEY_OEM_5:
+ return 0x1C;
+ // ctrl-] maps to \x1D (Group separator, Information separator three)
+ case ui::VKEY_OEM_6:
+ return 0x1D;
+ // ctrl-Enter maps to \x0A (Line feed)
+ case ui::VKEY_RETURN:
+ return 0x0A;
+ // Returns 0 for all other keys to avoid inputting unexpected chars.
+ default:
+ return 0;
+ }
+ }
+}
+
+} // namespace
+
+namespace content {
+
+// WebKeyboardEvent -----------------------------------------------------------
+
+WebKeyboardEvent WebInputEventFactory::keyboardEvent(const GdkEventKey* event) {
+ WebKeyboardEvent result;
+
+ result.timeStampSeconds = GdkEventTimeToWebEventTime(event->time);
+ result.modifiers = GdkStateToWebEventModifiers(NormalizeEventState(event));
+
+ switch (event->type) {
+ case GDK_KEY_RELEASE:
+ result.type = WebInputEvent::KeyUp;
+ break;
+ case GDK_KEY_PRESS:
+ result.type = WebInputEvent::RawKeyDown;
+ break;
+ default:
+ NOTREACHED();
+ }
+
+ // According to MSDN:
+ // http://msdn.microsoft.com/en-us/library/ms646286(VS.85).aspx
+ // Key events with Alt modifier and F10 are system key events.
+ // We just emulate this behavior. It's necessary to prevent webkit from
+ // processing keypress event generated by alt-d, etc.
+ // F10 is not special on Linux, so don't treat it as system key.
+ if (result.modifiers & WebInputEvent::AltKey)
+ result.isSystemKey = true;
+
+ // The key code tells us which physical key was pressed (for example, the
+ // A key went down or up). It does not determine whether A should be lower
+ // or upper case. This is what text does, which should be the keyval.
+ ui::KeyboardCode windows_key_code = GdkEventToWindowsKeyCode(event);
+ result.windowsKeyCode =
+ ui::GetWindowsKeyCodeWithoutLocation(windows_key_code);
+ result.modifiers |=
+ ui::GetLocationModifiersFromWindowsKeyCode(windows_key_code);
+ result.nativeKeyCode = event->hardware_keycode;
+
+ if (result.windowsKeyCode == ui::VKEY_RETURN) {
+ // We need to treat the enter key as a key press of character \r. This
+ // is apparently just how webkit handles it and what it expects.
+ result.unmodifiedText[0] = '\r';
+ } else {
+ // FIXME: fix for non BMP chars
+ result.unmodifiedText[0] =
+ static_cast<int>(gdk_keyval_to_unicode(event->keyval));
+ }
+
+ // If ctrl key is pressed down, then control character shall be input.
+ if (result.modifiers & WebInputEvent::ControlKey) {
+ result.text[0] =
+ GetControlCharacter(ui::KeyboardCode(result.windowsKeyCode),
+ result.modifiers & WebInputEvent::ShiftKey);
+ } else {
+ result.text[0] = result.unmodifiedText[0];
+ }
+
+ result.setKeyIdentifierFromWindowsKeyCode();
+
+ // FIXME: Do we need to set IsAutoRepeat?
+ if (IsKeyPadKeyval(event->keyval))
+ result.modifiers |= WebInputEvent::IsKeyPad;
+
+ return result;
+}
+
+WebKeyboardEvent WebInputEventFactory::keyboardEvent(wchar_t character,
+ int state,
+ double timeStampSeconds) {
+ // keyboardEvent(const GdkEventKey*) depends on the GdkEventKey object and
+ // it is hard to use/ it from signal handlers which don't use GdkEventKey
+ // objects (e.g. GtkIMContext signal handlers.) For such handlers, this
+ // function creates a WebInputEvent::Char event without using a
+ // GdkEventKey object.
+ WebKeyboardEvent result;
+ result.type = WebKit::WebInputEvent::Char;
+ result.timeStampSeconds = timeStampSeconds;
+ result.modifiers = GdkStateToWebEventModifiers(state);
+ result.windowsKeyCode = character;
+ result.nativeKeyCode = character;
+ result.text[0] = character;
+ result.unmodifiedText[0] = character;
+
+ // According to MSDN:
+ // http://msdn.microsoft.com/en-us/library/ms646286(VS.85).aspx
+ // Key events with Alt modifier and F10 are system key events.
+ // We just emulate this behavior. It's necessary to prevent webkit from
+ // processing keypress event generated by alt-d, etc.
+ // F10 is not special on Linux, so don't treat it as system key.
+ if (result.modifiers & WebInputEvent::AltKey)
+ result.isSystemKey = true;
+
+ return result;
+}
+
+// WebMouseEvent --------------------------------------------------------------
+
+WebMouseEvent WebInputEventFactory::mouseEvent(const GdkEventButton* event) {
+ WebMouseEvent result;
+
+ result.timeStampSeconds = GdkEventTimeToWebEventTime(event->time);
+
+ result.modifiers = GdkStateToWebEventModifiers(event->state);
+ result.x = static_cast<int>(event->x);
+ result.y = static_cast<int>(event->y);
+ result.windowX = result.x;
+ result.windowY = result.y;
+ result.globalX = static_cast<int>(event->x_root);
+ result.globalY = static_cast<int>(event->y_root);
+ result.clickCount = 0;
+
+ switch (event->type) {
+ case GDK_BUTTON_PRESS:
+ result.type = WebInputEvent::MouseDown;
+ break;
+ case GDK_BUTTON_RELEASE:
+ result.type = WebInputEvent::MouseUp;
+ break;
+ case GDK_3BUTTON_PRESS:
+ case GDK_2BUTTON_PRESS:
+ default:
+ NOTREACHED();
+ }
+
+ result.button = WebMouseEvent::ButtonNone;
+ if (event->button == 1)
+ result.button = WebMouseEvent::ButtonLeft;
+ else if (event->button == 2)
+ result.button = WebMouseEvent::ButtonMiddle;
+ else if (event->button == 3)
+ result.button = WebMouseEvent::ButtonRight;
+
+ if (result.type == WebInputEvent::MouseDown) {
+ bool forgetPreviousClick = ShouldForgetPreviousClick(
+ event->window, event->time, event->x, event->y);
+
+ if (!forgetPreviousClick && result.button == last_click_button)
+ ++num_clicks;
+ else {
+ num_clicks = 1;
+
+ lack_click_event_window = event->window;
+ last_click_x = event->x;
+ last_click_y = event->y;
+ last_click_button = result.button;
+ }
+ last_click_time = event->time;
+ }
+ result.clickCount = num_clicks;
+
+ return result;
+}
+
+WebMouseEvent WebInputEventFactory::mouseEvent(const GdkEventMotion* event) {
+ WebMouseEvent result;
+
+ result.timeStampSeconds = GdkEventTimeToWebEventTime(event->time);
+ result.modifiers = GdkStateToWebEventModifiers(event->state);
+ result.x = static_cast<int>(event->x);
+ result.y = static_cast<int>(event->y);
+ result.windowX = result.x;
+ result.windowY = result.y;
+ result.globalX = static_cast<int>(event->x_root);
+ result.globalY = static_cast<int>(event->y_root);
+
+ switch (event->type) {
+ case GDK_MOTION_NOTIFY:
+ result.type = WebInputEvent::MouseMove;
+ break;
+ default:
+ NOTREACHED();
+ }
+
+ result.button = WebMouseEvent::ButtonNone;
+ if (event->state & GDK_BUTTON1_MASK)
+ result.button = WebMouseEvent::ButtonLeft;
+ else if (event->state & GDK_BUTTON2_MASK)
+ result.button = WebMouseEvent::ButtonMiddle;
+ else if (event->state & GDK_BUTTON3_MASK)
+ result.button = WebMouseEvent::ButtonRight;
+
+ if (ShouldForgetPreviousClick(event->window, event->time, event->x, event->y))
+ ResetClickCountState();
+
+ return result;
+}
+
+WebMouseEvent WebInputEventFactory::mouseEvent(const GdkEventCrossing* event) {
+ WebMouseEvent result;
+
+ result.timeStampSeconds = GdkEventTimeToWebEventTime(event->time);
+ result.modifiers = GdkStateToWebEventModifiers(event->state);
+ result.x = static_cast<int>(event->x);
+ result.y = static_cast<int>(event->y);
+ result.windowX = result.x;
+ result.windowY = result.y;
+ result.globalX = static_cast<int>(event->x_root);
+ result.globalY = static_cast<int>(event->y_root);
+
+ switch (event->type) {
+ case GDK_ENTER_NOTIFY:
+ case GDK_LEAVE_NOTIFY:
+ // Note that if we sent MouseEnter or MouseLeave to WebKit, it
+ // wouldn't work - they don't result in the proper JavaScript events.
+ // MouseMove does the right thing.
+ result.type = WebInputEvent::MouseMove;
+ break;
+ default:
+ NOTREACHED();
+ }
+
+ result.button = WebMouseEvent::ButtonNone;
+ if (event->state & GDK_BUTTON1_MASK)
+ result.button = WebMouseEvent::ButtonLeft;
+ else if (event->state & GDK_BUTTON2_MASK)
+ result.button = WebMouseEvent::ButtonMiddle;
+ else if (event->state & GDK_BUTTON3_MASK)
+ result.button = WebMouseEvent::ButtonRight;
+
+ if (ShouldForgetPreviousClick(event->window, event->time, event->x, event->y))
+ ResetClickCountState();
+
+ return result;
+}
+
+// WebMouseWheelEvent ---------------------------------------------------------
+
+WebMouseWheelEvent WebInputEventFactory::mouseWheelEvent(
+ const GdkEventScroll* event) {
+ WebMouseWheelEvent result;
+
+ result.type = WebInputEvent::MouseWheel;
+ result.button = WebMouseEvent::ButtonNone;
+
+ result.timeStampSeconds = GdkEventTimeToWebEventTime(event->time);
+ result.modifiers = GdkStateToWebEventModifiers(event->state);
+ result.x = static_cast<int>(event->x);
+ result.y = static_cast<int>(event->y);
+ result.windowX = result.x;
+ result.windowY = result.y;
+ result.globalX = static_cast<int>(event->x_root);
+ result.globalY = static_cast<int>(event->y_root);
+
+ // How much should we scroll per mouse wheel event?
+ // - Windows uses 3 lines by default and obeys a system setting.
+ // - Mozilla has a pref that lets you either use the "system" number of lines
+ // to scroll, or lets the user override it.
+ // For the "system" number of lines, it appears they've hardcoded 3.
+ // See case NS_MOUSE_SCROLL in content/events/src/nsEventStateManager.cpp
+ // and InitMouseScrollEvent in widget/src/gtk2/nsCommonWidget.cpp .
+ // - Gtk makes the scroll amount a function of the size of the scroll bar,
+ // which is not available to us here.
+ // Instead, we pick a number that empirically matches Firefox's behavior.
+ static const float scrollbarPixelsPerTick = 160.0f / 3.0f;
+
+ switch (event->direction) {
+ case GDK_SCROLL_UP:
+ result.deltaY = scrollbarPixelsPerTick;
+ result.wheelTicksY = 1;
+ break;
+ case GDK_SCROLL_DOWN:
+ result.deltaY = -scrollbarPixelsPerTick;
+ result.wheelTicksY = -1;
+ break;
+ case GDK_SCROLL_LEFT:
+ result.deltaX = scrollbarPixelsPerTick;
+ result.wheelTicksX = 1;
+ break;
+ case GDK_SCROLL_RIGHT:
+ result.deltaX = -scrollbarPixelsPerTick;
+ result.wheelTicksX = -1;
+ break;
+ }
+
+ return result;
+}
+
+} // namespace content
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