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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
#include "mozilla/ArrayUtils.h"
#include "mozilla/MathAlgorithms.h"
#include "mozilla/Maybe.h"
#include "mozilla/NativeKeyBindingsType.h"
#include "mozilla/StaticPrefs_ui.h"
#include "mozilla/TextEvents.h"
#include "mozilla/WritingModes.h"
#include "NativeKeyBindings.h"
#include "nsString.h"
#include "nsGtkKeyUtils.h"
#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>
#include <gdk/gdkkeysyms-compat.h>
#include <gdk/gdk.h>
namespace mozilla {
namespace widget {
static nsTArray<CommandInt>* gCurrentCommands = nullptr;
static bool gHandled = false;
inline void AddCommand(Command aCommand) {
MOZ_ASSERT(gCurrentCommands);
gCurrentCommands->AppendElement(static_cast<CommandInt>(aCommand));
}
// Common GtkEntry and GtkTextView signals
static void copy_clipboard_cb(GtkWidget* w, gpointer user_data) {
AddCommand(Command::Copy);
g_signal_stop_emission_by_name(w, "copy_clipboard");
gHandled = true;
}
static void cut_clipboard_cb(GtkWidget* w, gpointer user_data) {
AddCommand(Command::Cut);
g_signal_stop_emission_by_name(w, "cut_clipboard");
gHandled = true;
}
// GTK distinguishes between display lines (wrapped, as they appear on the
// screen) and paragraphs, which are runs of text terminated by a newline.
// We don't have this distinction, so we always use editor's notion of
// lines, which are newline-terminated.
static const Command sDeleteCommands[][2] = {
// backward, forward
// CHARS
{Command::DeleteCharBackward, Command::DeleteCharForward},
// WORD_ENDS
{Command::DeleteWordBackward, Command::DeleteWordForward},
// WORDS
{Command::DeleteWordBackward, Command::DeleteWordForward},
// LINES
{Command::DeleteToBeginningOfLine, Command::DeleteToEndOfLine},
// LINE_ENDS
{Command::DeleteToBeginningOfLine, Command::DeleteToEndOfLine},
// PARAGRAPH_ENDS
{Command::DeleteToBeginningOfLine, Command::DeleteToEndOfLine},
// PARAGRAPHS
{Command::DeleteToBeginningOfLine, Command::DeleteToEndOfLine},
// This deletes from the end of the previous word to the beginning of the
// next word, but only if the caret is not in a word.
// XXX need to implement in editor
{Command::DoNothing, Command::DoNothing} // WHITESPACE
};
static void delete_from_cursor_cb(GtkWidget* w, GtkDeleteType del_type,
gint count, gpointer user_data) {
g_signal_stop_emission_by_name(w, "delete_from_cursor");
if (count == 0) {
// Nothing to do.
return;
}
bool forward = count > 0;
// Ignore GTK's Ctrl-K keybinding introduced in GTK 3.14 and removed in
if (del_type == GTK_DELETE_PARAGRAPH_ENDS && forward && GTK_IS_ENTRY(w) &&
!gtk_check_version(3, 14, 1) && gtk_check_version(3, 17, 9)) {
GtkStyleContext* context = gtk_widget_get_style_context(w);
GtkStateFlags flags = gtk_widget_get_state_flags(w);
GPtrArray* array;
gtk_style_context_get(context, flags, "gtk-key-bindings", &array, nullptr);
if (!array) return;
g_ptr_array_unref(array);
}
gHandled = true;
if (uint32_t(del_type) >= ArrayLength(sDeleteCommands)) {
// unsupported deletion type
return;
}
if (del_type == GTK_DELETE_WORDS) {
// This works like word_ends, except we first move the caret to the
// beginning/end of the current word.
if (forward) {
AddCommand(Command::WordNext);
AddCommand(Command::WordPrevious);
} else {
AddCommand(Command::WordPrevious);
AddCommand(Command::WordNext);
}
} else if (del_type == GTK_DELETE_DISPLAY_LINES ||
del_type == GTK_DELETE_PARAGRAPHS) {
// This works like display_line_ends, except we first move the caret to the
// beginning/end of the current line.
if (forward) {
AddCommand(Command::BeginLine);
} else {
AddCommand(Command::EndLine);
}
}
Command command = sDeleteCommands[del_type][forward];
if (command == Command::DoNothing) {
return;
}
unsigned int absCount = Abs(count);
for (unsigned int i = 0; i < absCount; ++i) {
AddCommand(command);
}
}
static const Command sMoveCommands[][2][2] = {
// non-extend { backward, forward }, extend { backward, forward }
// GTK differentiates between logical position, which is prev/next,
// and visual position, which is always left/right.
// We should fix this to work the same way for RTL text input.
{// LOGICAL_POSITIONS
{Command::CharPrevious, Command::CharNext},
{Command::SelectCharPrevious, Command::SelectCharNext}},
{// VISUAL_POSITIONS
{Command::CharPrevious, Command::CharNext},
{Command::SelectCharPrevious, Command::SelectCharNext}},
{// WORDS
{Command::WordPrevious, Command::WordNext},
{Command::SelectWordPrevious, Command::SelectWordNext}},
{// DISPLAY_LINES
{Command::LinePrevious, Command::LineNext},
{Command::SelectLinePrevious, Command::SelectLineNext}},
{// DISPLAY_LINE_ENDS
{Command::BeginLine, Command::EndLine},
{Command::SelectBeginLine, Command::SelectEndLine}},
{// PARAGRAPHS
{Command::LinePrevious, Command::LineNext},
{Command::SelectLinePrevious, Command::SelectLineNext}},
{// PARAGRAPH_ENDS
{Command::BeginLine, Command::EndLine},
{Command::SelectBeginLine, Command::SelectEndLine}},
{// PAGES
{Command::MovePageUp, Command::MovePageDown},
{Command::SelectPageUp, Command::SelectPageDown}},
{// BUFFER_ENDS
{Command::MoveTop, Command::MoveBottom},
{Command::SelectTop, Command::SelectBottom}},
{// HORIZONTAL_PAGES (unsupported)
{Command::DoNothing, Command::DoNothing},
{Command::DoNothing, Command::DoNothing}}};
static void move_cursor_cb(GtkWidget* w, GtkMovementStep step, gint count,
gboolean extend_selection, gpointer user_data) {
g_signal_stop_emission_by_name(w, "move_cursor");
if (count == 0) {
// Nothing to do.
return;
}
gHandled = true;
bool forward = count > 0;
if (uint32_t(step) >= ArrayLength(sMoveCommands)) {
// unsupported movement type
return;
}
Command command = sMoveCommands[step][extend_selection][forward];
if (command == Command::DoNothing) {
return;
}
unsigned int absCount = Abs(count);
for (unsigned int i = 0; i < absCount; ++i) {
AddCommand(command);
}
}
static void paste_clipboard_cb(GtkWidget* w, gpointer user_data) {
AddCommand(Command::Paste);
g_signal_stop_emission_by_name(w, "paste_clipboard");
gHandled = true;
}
// GtkTextView-only signals
static void select_all_cb(GtkWidget* aWidget, gboolean aSelect,
gpointer aUserData) {
// We don't support "Unselect All" command.
// Note that if we'd support it, `Ctrl-Shift-a` will be mapped to it and
// overrides open `about:addons` shortcut.
if (aSelect) {
AddCommand(Command::SelectAll);
}
g_signal_stop_emission_by_name(aWidget, "select_all");
// Although we prevent the default of `GtkTExtView` with
// `g_signal_stop_emission_by_name`, but `gHandled` is used for asserting
// if it does not match with the emptiness of the command array.
// Therefore, we should not set it to `true` if we don't add a command.
gHandled |= aSelect;
}
NativeKeyBindings* NativeKeyBindings::sInstanceForSingleLineEditor = nullptr;
NativeKeyBindings* NativeKeyBindings::sInstanceForMultiLineEditor = nullptr;
// static
NativeKeyBindings* NativeKeyBindings::GetInstance(NativeKeyBindingsType aType) {
switch (aType) {
case NativeKeyBindingsType::SingleLineEditor:
if (!sInstanceForSingleLineEditor) {
sInstanceForSingleLineEditor = new NativeKeyBindings();
sInstanceForSingleLineEditor->Init(aType);
}
return sInstanceForSingleLineEditor;
default:
// fallback to multiline editor case in release build
MOZ_FALLTHROUGH_ASSERT("aType is invalid or not yet implemented");
case NativeKeyBindingsType::MultiLineEditor:
case NativeKeyBindingsType::RichTextEditor:
if (!sInstanceForMultiLineEditor) {
sInstanceForMultiLineEditor = new NativeKeyBindings();
sInstanceForMultiLineEditor->Init(aType);
}
return sInstanceForMultiLineEditor;
}
}
// static
void NativeKeyBindings::Shutdown() {
delete sInstanceForSingleLineEditor;
sInstanceForSingleLineEditor = nullptr;
delete sInstanceForMultiLineEditor;
sInstanceForMultiLineEditor = nullptr;
}
void NativeKeyBindings::Init(NativeKeyBindingsType aType) {
switch (aType) {
case NativeKeyBindingsType::SingleLineEditor:
mNativeTarget = gtk_entry_new();
break;
default:
mNativeTarget = gtk_text_view_new();
g_signal_connect(mNativeTarget, "select_all", G_CALLBACK(select_all_cb),
this);
break;
}
g_object_ref_sink(mNativeTarget);
g_signal_connect(mNativeTarget, "copy_clipboard",
G_CALLBACK(copy_clipboard_cb), this);
g_signal_connect(mNativeTarget, "cut_clipboard", G_CALLBACK(cut_clipboard_cb),
this);
g_signal_connect(mNativeTarget, "delete_from_cursor",
G_CALLBACK(delete_from_cursor_cb), this);
g_signal_connect(mNativeTarget, "move_cursor", G_CALLBACK(move_cursor_cb),
this);
g_signal_connect(mNativeTarget, "paste_clipboard",
G_CALLBACK(paste_clipboard_cb), this);
}
NativeKeyBindings::~NativeKeyBindings() {
gtk_widget_destroy(mNativeTarget);
g_object_unref(mNativeTarget);
}
void NativeKeyBindings::GetEditCommands(const WidgetKeyboardEvent& aEvent,
const Maybe<WritingMode>& aWritingMode,
nsTArray<CommandInt>& aCommands) {
MOZ_ASSERT(!aEvent.mFlags.mIsSynthesizedForTests);
MOZ_ASSERT(aCommands.IsEmpty());
// It must be a DOM event dispached by chrome script.
if (!aEvent.mNativeKeyEvent) {
return;
}
guint keyval;
if (aEvent.mCharCode) {
keyval = gdk_unicode_to_keyval(aEvent.mCharCode);
} else if (aWritingMode.isSome() && aEvent.NeedsToRemapNavigationKey() &&
aWritingMode.ref().IsVertical()) {
// TODO: Use KeyNameIndex rather than legacy keyCode.
uint32_t remappedGeckoKeyCode =
aEvent.GetRemappedKeyCode(aWritingMode.ref());
switch (remappedGeckoKeyCode) {
case NS_VK_UP:
keyval = GDK_Up;
break;
case NS_VK_DOWN:
keyval = GDK_Down;
break;
case NS_VK_LEFT:
keyval = GDK_Left;
break;
case NS_VK_RIGHT:
keyval = GDK_Right;
break;
default:
MOZ_ASSERT_UNREACHABLE("Add a case for the new remapped key");
return;
}
} else {
keyval = static_cast<GdkEventKey*>(aEvent.mNativeKeyEvent)->keyval;
}
if (GetEditCommandsInternal(aEvent, aCommands, keyval)) {
return;
}
for (uint32_t i = 0; i < aEvent.mAlternativeCharCodes.Length(); ++i) {
uint32_t ch = aEvent.IsShift()
? aEvent.mAlternativeCharCodes[i].mShiftedCharCode
: aEvent.mAlternativeCharCodes[i].mUnshiftedCharCode;
if (ch && ch != aEvent.mCharCode) {
keyval = gdk_unicode_to_keyval(ch);
if (GetEditCommandsInternal(aEvent, aCommands, keyval)) {
return;
}
}
}
// If the key event does not cause any commands, and we're for single line
// editor, let's check whether the key combination is for "select-all" in
// GtkTextView because the signal is not supported by GtkEntry.
if (aCommands.IsEmpty() && this == sInstanceForSingleLineEditor &&
StaticPrefs::ui_key_use_select_all_in_single_line_editor()) {
if (NativeKeyBindings* bindingsForMultilineEditor =
GetInstance(NativeKeyBindingsType::MultiLineEditor)) {
bindingsForMultilineEditor->GetEditCommands(aEvent, aWritingMode,
aCommands);
if (aCommands.Length() == 1u &&
aCommands[0u] == static_cast<CommandInt>(Command::SelectAll)) {
return;
}
aCommands.Clear();
}
}
/*
gtk_bindings_activate_event is preferable, but it has unresolved bug:
The bug was already marked as FIXED. However, somebody reports that the
bug still exists.
Also gtk_bindings_activate may work with some non-shortcuts operations
gtk_bindings_activate_event(GTK_OBJECT(mNativeTarget),
static_cast<GdkEventKey*>(aEvent.mNativeKeyEvent));
*/
}
bool NativeKeyBindings::GetEditCommandsInternal(
const WidgetKeyboardEvent& aEvent, nsTArray<CommandInt>& aCommands,
guint aKeyval) {
guint modifiers = static_cast<GdkEventKey*>(aEvent.mNativeKeyEvent)->state;
gCurrentCommands = &aCommands;
gHandled = false;
gtk_bindings_activate(G_OBJECT(mNativeTarget), aKeyval,
GdkModifierType(modifiers));
gCurrentCommands = nullptr;
return gHandled;
}
// static
void NativeKeyBindings::GetEditCommandsForTests(
NativeKeyBindingsType aType, const WidgetKeyboardEvent& aEvent,
const Maybe<WritingMode>& aWritingMode, nsTArray<CommandInt>& aCommands) {
MOZ_DIAGNOSTIC_ASSERT(aEvent.IsTrusted());
if (aEvent.IsAlt() || aEvent.IsMeta()) {
return;
}
static const size_t kBackward = 0;
static const size_t kForward = 1;
const size_t extentSelection = aEvent.IsShift() ? 1 : 0;
// https://github.com/GNOME/gtk/blob/c5dd34344f0c660ceffffb3bf9da43c263db16e1/gtk/gtktextview.c#L1534
Command command = Command::DoNothing;
const KeyNameIndex remappedKeyNameIndex =
aWritingMode.isSome() ? aEvent.GetRemappedKeyNameIndex(aWritingMode.ref())
: aEvent.mKeyNameIndex;
switch (remappedKeyNameIndex) {
case KEY_NAME_INDEX_USE_STRING:
switch (aEvent.PseudoCharCode()) {
case 'a':
case 'A':
if (aEvent.IsControl()) {
command = Command::SelectAll;
}
break;
case 'c':
case 'C':
if (aEvent.IsControl() && !aEvent.IsShift()) {
command = Command::Copy;
}
break;
case 'u':
case 'U':
if (aType == NativeKeyBindingsType::SingleLineEditor &&
aEvent.IsControl() && !aEvent.IsShift()) {
command = sDeleteCommands[GTK_DELETE_PARAGRAPH_ENDS][kBackward];
}
break;
case 'v':
case 'V':
if (aEvent.IsControl() && !aEvent.IsShift()) {
command = Command::Paste;
}
break;
case 'x':
case 'X':
if (aEvent.IsControl() && !aEvent.IsShift()) {
command = Command::Cut;
}
break;
case '/':
if (aEvent.IsControl() && !aEvent.IsShift()) {
command = Command::SelectAll;
}
break;
default:
break;
}
break;
case KEY_NAME_INDEX_Insert:
if (aEvent.IsControl() && !aEvent.IsShift()) {
command = Command::Copy;
} else if (aEvent.IsShift() && !aEvent.IsControl()) {
command = Command::Paste;
}
break;
case KEY_NAME_INDEX_Delete:
if (aEvent.IsShift()) {
command = Command::Cut;
break;
}
[[fallthrough]];
case KEY_NAME_INDEX_Backspace: {
const size_t direction =
remappedKeyNameIndex == KEY_NAME_INDEX_Delete ? kForward : kBackward;
const GtkDeleteType amount =
aEvent.IsControl() && aEvent.IsShift()
? GTK_DELETE_PARAGRAPH_ENDS
// FYI: Shift key for Backspace is ignored to help mis-typing.
: (aEvent.IsControl() ? GTK_DELETE_WORD_ENDS : GTK_DELETE_CHARS);
command = sDeleteCommands[amount][direction];
break;
}
case KEY_NAME_INDEX_ArrowLeft:
case KEY_NAME_INDEX_ArrowRight: {
const size_t direction = remappedKeyNameIndex == KEY_NAME_INDEX_ArrowRight
? kForward
: kBackward;
const GtkMovementStep amount = aEvent.IsControl()
? GTK_MOVEMENT_WORDS
: GTK_MOVEMENT_VISUAL_POSITIONS;
command = sMoveCommands[amount][extentSelection][direction];
break;
}
case KEY_NAME_INDEX_ArrowUp:
case KEY_NAME_INDEX_ArrowDown: {
const size_t direction = remappedKeyNameIndex == KEY_NAME_INDEX_ArrowDown
? kForward
: kBackward;
const GtkMovementStep amount = aEvent.IsControl()
? GTK_MOVEMENT_PARAGRAPHS
: GTK_MOVEMENT_DISPLAY_LINES;
command = sMoveCommands[amount][extentSelection][direction];
break;
}
case KEY_NAME_INDEX_Home:
case KEY_NAME_INDEX_End: {
const size_t direction =
remappedKeyNameIndex == KEY_NAME_INDEX_End ? kForward : kBackward;
const GtkMovementStep amount = aEvent.IsControl()
? GTK_MOVEMENT_BUFFER_ENDS
: GTK_MOVEMENT_DISPLAY_LINE_ENDS;
command = sMoveCommands[amount][extentSelection][direction];
break;
}
case KEY_NAME_INDEX_PageUp:
case KEY_NAME_INDEX_PageDown: {
const size_t direction = remappedKeyNameIndex == KEY_NAME_INDEX_PageDown
? kForward
: kBackward;
const GtkMovementStep amount = aEvent.IsControl()
? GTK_MOVEMENT_HORIZONTAL_PAGES
: GTK_MOVEMENT_PAGES;
command = sMoveCommands[amount][extentSelection][direction];
break;
}
default:
break;
}
if (command != Command::DoNothing) {
aCommands.AppendElement(static_cast<CommandInt>(command));
}
}
} // namespace widget
} // namespace mozilla