input: Implement click finger behaviour (enabled by default)

input touchpad settings header:
- click finger behaviour (enabled by default)
- Emulation of different button clicks depending on the
  number of fingers that are pressed at the same time on
  any location of the touchable surface of the device.
    - Clicking with 1 finger triggers a primary button click,
      usually left button click.
    - Clicking with 2 fingers triggers a secondary button click,
      usually right button click.
    - Clicking with 3 fingers triggers a terciary button click,
      usually middle button click.

  This feature is useful for clickpads that are input devices
  lacking a separated set of buttons from the touch area.

input preflet:
- Implement clickfinger

input mouse:
- Handle and provide new settings for clickfinger behaviour

input mouse mm:
- Implement clickfinger in the user space
- Enables button emulation based on the number of fingers pressing
  at the same time the touch surface.

  Userful feature for clickpads.

Change-Id: Ibaa06df3887793158093cc08f6281fc080e85c3b
Reviewed-on: https://review.haiku-os.org/c/haiku/+/9923
Reviewed-by: Adrien Destugues <[email protected]>

headers/private/input/touchpad_settings.h

@@ -34,6 +34,10 @@ typedef struct {
 									// 0x04: edge motion on button click move
 									// 0x08: edge motion on button click drag
 
+	bool	finger_click;			// 1 finger click -> click button id 1
+									// 2 fingers' click -> click button id 2
+									// 3 fingers' click -> click button id 3
+
 	bool	software_button_areas;
 } touchpad_settings;
 
@@ -53,6 +57,7 @@ const static touchpad_settings kDefaultTouchpadSettings = {
 	false,
 	true,
 	0x02,
+	true,
 	false
 };
 

src/add-ons/input_server/devices/mouse/MouseInputDevice.cpp

@@ -608,6 +608,8 @@ MouseDevice::_UpdateTouchpadSettings(BMessage* message)
 		&settings.scroll_twofinger_natural_scrolling);
 	message->FindInt8("edge_motion",
 		(int8*)&settings.edge_motion);
+	message->FindBool("finger_click",
+		&settings.finger_click);
 	message->FindBool("software_button_areas",
 		&settings.software_button_areas);
 

src/add-ons/input_server/devices/mouse/movement_maker.cpp

@@ -353,6 +353,7 @@ TouchpadMovement::EventToMovement(const touchpad_movement* _event, mouse_movemen
 	movement->timestamp = system_time();
 
 	touchpad_movement event2 = *_event;
+	if (!_ClickFingerButtonEmulator(&event2))
 		_SoftwareButtonAreas(&event2);
 	const touchpad_movement* event = &event2;
 
@@ -398,6 +399,27 @@ TouchpadMovement::EventToMovement(const touchpad_movement* _event, mouse_movemen
 }
 
 
+bool
+TouchpadMovement::_ClickFingerButtonEmulator(touchpad_movement *event) {
+	CALLED();
+
+	if (event->buttons != 0) {
+		// ClickFinger behaviour.
+		// Simulate with 2 fingers click => right button click
+		// Simulate with 3 fingers click => middle button click
+		if (fSettings.finger_click && two_fingers(event)) {
+			event->buttons = 2;
+			return true;
+		} else if (fSettings.finger_click && three_fingers(event)) {
+			event->buttons = 4;
+			return true;
+		}
+	}
+
+	return false;
+}
+
+
 void
 TouchpadMovement::_SoftwareButtonAreas(touchpad_movement *event) {
 	CALLED();

src/add-ons/input_server/devices/mouse/movement_maker.h

@@ -76,6 +76,7 @@ private:
 			void				_UpdateButtons(mouse_movement *movement);
 			bool				_EdgeMotion(const touchpad_movement *event,
 									mouse_movement *movement, bool validStart);
+	inline	bool				_ClickFingerButtonEmulator(touchpad_movement *event);
 	inline	void				_SoftwareButtonAreas(touchpad_movement *event);
 	inline	void				_NoTouchToMovement(const touchpad_movement *event,
 									mouse_movement *movement);

src/preferences/input/InputTouchpadPref.cpp

@@ -72,6 +72,7 @@ TouchpadPref::BuildSettingsMessage()
 	msg.AddInt32("trackpad_acceleration", fSettings.trackpad_acceleration);
 	msg.AddBool("scroll_twofinger_natural_scrolling", fSettings.scroll_twofinger_natural_scrolling);
 	msg.AddInt8("edge_motion", fSettings.edge_motion);
+	msg.AddBool("finger_click", fSettings.finger_click);
 	msg.AddBool("software_button_areas", fSettings.software_button_areas);
 
 	return msg;
@@ -161,6 +162,9 @@ TouchpadPref::LoadSettings()
 	fSettings.edge_motion = settingsMsg.GetInt8(
 		"edge_motion",
 		kDefaultTouchpadSettings.edge_motion);
+	fSettings.finger_click = settingsMsg.GetBool(
+		"finger_click",
+		kDefaultTouchpadSettings.finger_click);
 	fSettings.software_button_areas = settingsMsg.GetBool(
 		"software_button_areas",
 		kDefaultTouchpadSettings.software_button_areas);

src/preferences/input/InputTouchpadPrefView.cpp

@@ -315,6 +315,12 @@ TouchpadPrefView::MessageReceived(BMessage* message)
 			fTouchpadPref.UpdateRunningSettings();
 			break;
 
+		case FINGER_CLICK_CHANGED:
+			settings.finger_click = fFingerClickBox->Value() == B_CONTROL_ON;
+			fRevertButton->SetEnabled(true);
+			fTouchpadPref.UpdateRunningSettings();
+			break;
+
 		case SOFTWARE_BUTTON_AREAS_CHANGED:
 			settings.software_button_areas = fSoftwareButtonAreasBox->Value() == B_CONTROL_ON;
 			fRevertButton->SetEnabled(true);
@@ -382,6 +388,7 @@ TouchpadPrefView::AttachedToWindow()
 	fScrollAccelSlider->SetTarget(this);
 
 	fEdgeMotionOptionPopUp->SetTarget(this);
+	fFingerClickBox->SetTarget(this);
 	fSoftwareButtonAreasBox->SetTarget(this);
 
 	fPadBlockerSlider->SetTarget(this);
@@ -479,6 +486,8 @@ TouchpadPrefView::SetupView()
 		B_EDGE_MOTION_ON_MOVE | B_EDGE_MOTION_ON_TAP_DRAG
 		| B_EDGE_MOTION_ON_BUTTON_CLICK_MOVE | B_EDGE_MOTION_ON_BUTTON_CLICK_DRAG);
 
+	fFingerClickBox = new BCheckBox(B_TRANSLATE("Finger click"),
+		new BMessage(FINGER_CLICK_CHANGED));
 	fSoftwareButtonAreasBox = new BCheckBox(B_TRANSLATE("Software button areas"),
 		new BMessage(SOFTWARE_BUTTON_AREAS_CHANGED));
 
@@ -545,7 +554,11 @@ TouchpadPrefView::SetupView()
 		.SetInsets(B_USE_WINDOW_SPACING)
 		.Add(scrollBox)
 		.Add(fEdgeMotionOptionPopUp)
+		.AddGroup(B_HORIZONTAL, B_USE_DEFAULT_SPACING)
+			.Add(fFingerClickBox)
+			.Add(new BSeparatorView(B_VERTICAL))
 			.Add(fSoftwareButtonAreasBox)
+			.End()
 		.Add(new BSeparatorView(B_HORIZONTAL))
 		.AddGroup(B_HORIZONTAL, B_USE_DEFAULT_SPACING)
 			.AddGroup(B_VERTICAL, B_USE_DEFAULT_SPACING)
@@ -580,6 +593,7 @@ TouchpadPrefView::SetValues(touchpad_settings* settings)
 	fTwoFingerNaturalScrollingBox->SetValue(
 		settings->scroll_twofinger_natural_scrolling ? B_CONTROL_ON : B_CONTROL_OFF);
 	fTwoFingerNaturalScrollingBox->SetEnabled(settings->scroll_twofinger);
+	fFingerClickBox->SetValue(settings->finger_click);
 	fSoftwareButtonAreasBox->SetValue(settings->software_button_areas);
 	fEdgeMotionOptionPopUp->SetValue(settings->edge_motion);
 	fScrollStepXSlider->SetValue(20 - settings->scroll_xstepsize / 2);

src/preferences/input/InputTouchpadPrefView.h

@@ -41,6 +41,7 @@ const uint PADBLOCK_TIME_CHANGED = '&ptc';
 const uint PAD_SPEED_CHANGED = '&psc';
 const uint PAD_ACCELERATION_CHANGED = '&pac';
 const uint EDGE_MOTION_CHANGED = '&emc';
+const uint FINGER_CLICK_CHANGED = '&fcc';
 const uint SOFTWARE_BUTTON_AREAS_CHANGED = '&sbc';
 
 class DeviceListView;
@@ -102,6 +103,7 @@ private:
 			BCheckBox*		fTwoFingerBox;
 			BCheckBox*		fTwoFingerHorizontalBox;
 			BCheckBox*		fTwoFingerNaturalScrollingBox;
+			BCheckBox*		fFingerClickBox;
 			BCheckBox*		fSoftwareButtonAreasBox;
 			BSlider*		fScrollStepXSlider;
 			BSlider*		fScrollStepYSlider;