/*
 * Copyright 2009-2010, Axel Dörfler, axeld@pinc-software.de.
 * Copyright 2013-2014 Haiku, Inc. All rights reserved.
 * Distributed under the terms of the MIT License.
 *
 * Authors:
 *		Axel Dörfler, axeld@pinc-software.de
 *		John Scipione, jscipione@gmail.com
 */
 
 
#include "KeyboardLayoutView.h"
 
#include <stdio.h>
#include <stdlib.h>
 
#include <Beep.h>
#include <Bitmap.h>
#include <ControlLook.h>
#include <LayoutUtils.h>
#include <MenuItem.h>
#include <PopUpMenu.h>
#include <Region.h>
#include <Window.h>
 
#include "Keymap.h"
#include "KeymapApplication.h"
 
 
#undef B_TRANSLATION_CONTEXT
#define B_TRANSLATION_CONTEXT "Keyboard Layout View"
 
 
static const rgb_color kBrightColor = {230, 230, 230, 255};
static const rgb_color kDarkColor = {200, 200, 200, 255};
static const rgb_color kSecondDeadKeyColor = {240, 240, 150, 255};
static const rgb_color kDeadKeyColor = {152, 203, 255, 255};
static const rgb_color kLitIndicatorColor = {116, 212, 83, 255};
 
 
static bool
is_left_modifier_key(uint32 keyCode)
{
	return keyCode == 0x4b	// left shift
		|| keyCode == 0x5d	// left command
		|| keyCode == 0x5c	// left control
		|| keyCode == 0x66;	// left option
}
 
 
static bool
is_right_modifier_key(uint32 keyCode)
{
	return keyCode == 0x56	// right shift
		|| keyCode == 0x5f	// right command
		|| keyCode == 0x60	// right control
		|| keyCode == 0x67	// right option
		|| keyCode == 0x68;	// menu
}
 
 
static bool
is_lock_key(uint32 keyCode)
{
	return keyCode == 0x3b	// caps lock
		|| keyCode == 0x22	// num lock
		|| keyCode == 0x0f;	// scroll lock
}
 
 
static bool
is_mappable_to_modifier(uint32 keyCode)
{
	return is_left_modifier_key(keyCode)
		|| is_right_modifier_key(keyCode)
		|| is_lock_key(keyCode);
}
 
 
//	#pragma mark - KeyboardLayoutView
 
 
KeyboardLayoutView::KeyboardLayoutView(const char* name)
	:
	BView(name, B_WILL_DRAW | B_FULL_UPDATE_ON_RESIZE | B_FRAME_EVENTS),
	fOffscreenBitmap(NULL),
	fKeymap(NULL),
	fEditable(true),
	fModifiers(0),
	fDeadKey(0),
	fButtons(0),
	fDragKey(NULL),
	fDropTarget(NULL),
	fOldSize(0, 0)
{
	fLayout = new KeyboardLayout;
	memset(fKeyState, 0, sizeof(fKeyState));
 
	SetEventMask(B_KEYBOARD_EVENTS);
}
 
 
KeyboardLayoutView::~KeyboardLayoutView()
{
	delete fOffscreenBitmap;
}
 
 
void
KeyboardLayoutView::SetKeyboardLayout(KeyboardLayout* layout)
{
	fLayout = layout;
	_InitOffscreen();
	_LayoutKeyboard();
	Invalidate();
}
 
 
void
KeyboardLayoutView::SetKeymap(Keymap* keymap)
{
	fKeymap = keymap;
	Invalidate();
}
 
 
void
KeyboardLayoutView::SetTarget(BMessenger target)
{
	fTarget = target;
}
 
 
void
KeyboardLayoutView::SetBaseFont(const BFont& font)
{
	fBaseFont = font;
 
	font_height fontHeight;
	fBaseFont.GetHeight(&fontHeight);
	fBaseFontHeight = fontHeight.ascent + fontHeight.descent;
	fBaseFontSize = fBaseFont.Size();
 
	Invalidate();
}
 
 
void
KeyboardLayoutView::AttachedToWindow()
{
	SetViewColor(B_TRANSPARENT_COLOR);
 
	SetBaseFont(*be_plain_font);
	fSpecialFont = *be_fixed_font;
	fModifiers = modifiers();
}
 
 
void
KeyboardLayoutView::FrameResized(float width, float height)
{
	_InitOffscreen();
	_LayoutKeyboard();
}
 
 
void
KeyboardLayoutView::WindowActivated(bool active)
{
	if (active)
		Invalidate();
}
 
 
BSize
KeyboardLayoutView::MinSize()
{
	return BLayoutUtils::ComposeSize(ExplicitMinSize(), BSize(100, 50));
}
 
 
void
KeyboardLayoutView::KeyDown(const char* bytes, int32 numBytes)
{
	_KeyChanged(Window()->CurrentMessage());
}
 
 
void
KeyboardLayoutView::KeyUp(const char* bytes, int32 numBytes)
{
	_KeyChanged(Window()->CurrentMessage());
}
 
 
void
KeyboardLayoutView::MouseDown(BPoint point)
{
	fClickPoint = point;
	fDragKey = NULL;
	fDropPoint.x = -1;
 
	int32 buttons = 0;
	if (Looper() != NULL && Looper()->CurrentMessage() != NULL)
		Looper()->CurrentMessage()->FindInt32("buttons", &buttons);
 
	Key* key = _KeyAt(point);
	if (fKeymap == NULL || key == NULL) {
		fButtons = buttons;
		return;
	}
 
	if ((buttons & B_SECONDARY_MOUSE_BUTTON) != 0
			|| ((buttons & B_PRIMARY_MOUSE_BUTTON) != 0
		&& (modifiers() & B_CONTROL_KEY) != 0)) {
		// secondary mouse button, pop up a swap context menu
		if (!is_mappable_to_modifier(key->code)) {
			// ToDo: Pop up a list of alternative characters to map
			// the key to. Currently we only add an option to remove the
			// current key mapping.
			BPopUpMenu* alternativesPopUp = new BPopUpMenu(
				"Alternatives pop up", true, true, B_ITEMS_IN_COLUMN);
			BMessage* message = new BMessage(kMsgUpdateNormalKeys);
			message->AddUInt32("keyCode", key->code);
			message->AddBool("unset", true);
			alternativesPopUp->AddItem(new BMenuItem(B_TRANSLATE("Remove"),
				message));
			alternativesPopUp->SetAsyncAutoDestruct(true);
			if (alternativesPopUp->SetTargetForItems(Window()) == B_OK)
				alternativesPopUp->Go(ConvertToScreen(point), true);
		} else {
			// pop up the modifier keys menu
			BPopUpMenu* modifiersPopUp = new BPopUpMenu("Modifiers pop up",
				true, true, B_ITEMS_IN_COLUMN);
			const key_map& map = fKeymap->Map();
			bool isLockKey = is_lock_key(key->code);
			BMenuItem* item = NULL;
 
			if (is_left_modifier_key(key->code) || isLockKey) {
				item = _CreateSwapModifiersMenuItem(B_LEFT_SHIFT_KEY,
					isLockKey ? B_LEFT_SHIFT_KEY : B_SHIFT_KEY,
					map.left_shift_key, key->code);
				modifiersPopUp->AddItem(item);
				if (key->code == map.left_shift_key)
					item->SetMarked(true);
 
				item = _CreateSwapModifiersMenuItem(B_LEFT_CONTROL_KEY,
					isLockKey ? B_LEFT_CONTROL_KEY : B_CONTROL_KEY,
					map.left_control_key, key->code);
				modifiersPopUp->AddItem(item);
				if (key->code == map.left_control_key)
					item->SetMarked(true);
 
				item = _CreateSwapModifiersMenuItem(B_LEFT_OPTION_KEY,
					isLockKey ? B_LEFT_OPTION_KEY : B_OPTION_KEY,
					map.left_option_key, key->code);
				modifiersPopUp->AddItem(item);
				if (key->code == map.left_option_key)
					item->SetMarked(true);
 
				item = _CreateSwapModifiersMenuItem(B_LEFT_COMMAND_KEY,
					isLockKey ? B_LEFT_COMMAND_KEY : B_COMMAND_KEY,
					map.left_command_key, key->code);
				modifiersPopUp->AddItem(item);
				if (key->code == map.left_command_key)
					item->SetMarked(true);
			}
 
			if (is_right_modifier_key(key->code) || isLockKey) {
				if (isLockKey)
					modifiersPopUp->AddSeparatorItem();
 
				item = _CreateSwapModifiersMenuItem(B_RIGHT_SHIFT_KEY,
					isLockKey ? B_RIGHT_SHIFT_KEY : B_SHIFT_KEY,
					map.right_shift_key, key->code);
				modifiersPopUp->AddItem(item);
				if (key->code == map.right_shift_key)
					item->SetMarked(true);
 
				item = _CreateSwapModifiersMenuItem(B_RIGHT_CONTROL_KEY,
					isLockKey ? B_RIGHT_CONTROL_KEY : B_CONTROL_KEY,
					map.right_control_key, key->code);
				modifiersPopUp->AddItem(item);
				if (key->code == map.right_control_key)
					item->SetMarked(true);
			}
 
			item = _CreateSwapModifiersMenuItem(B_MENU_KEY, B_MENU_KEY,
				map.menu_key, key->code);
			modifiersPopUp->AddItem(item);
			if (key->code == map.menu_key)
				item->SetMarked(true);
 
			if (is_right_modifier_key(key->code) || isLockKey) {
				item = _CreateSwapModifiersMenuItem(B_RIGHT_OPTION_KEY,
					isLockKey ? B_RIGHT_OPTION_KEY : B_OPTION_KEY,
					map.right_option_key, key->code);
				modifiersPopUp->AddItem(item);
				if (key->code == map.right_option_key)
					item->SetMarked(true);
 
				item = _CreateSwapModifiersMenuItem(B_RIGHT_COMMAND_KEY,
					isLockKey ? B_RIGHT_COMMAND_KEY : B_COMMAND_KEY,
					map.right_command_key, key->code);
				modifiersPopUp->AddItem(item);
				if (key->code == map.right_command_key)
					item->SetMarked(true);
			}
 
			modifiersPopUp->AddSeparatorItem();
 
			item = _CreateSwapModifiersMenuItem(B_CAPS_LOCK, B_CAPS_LOCK,
				map.caps_key, key->code);
			modifiersPopUp->AddItem(item);
			if (key->code == map.caps_key)
				item->SetMarked(true);
 
			item = _CreateSwapModifiersMenuItem(B_NUM_LOCK, B_NUM_LOCK,
				map.num_key, key->code);
			modifiersPopUp->AddItem(item);
			if (key->code == map.num_key)
				item->SetMarked(true);
 
			item = _CreateSwapModifiersMenuItem(B_SCROLL_LOCK, B_SCROLL_LOCK,
				map.scroll_key, key->code);
			modifiersPopUp->AddItem(item);
			if (key->code == map.scroll_key)
				item->SetMarked(true);
 
			modifiersPopUp->SetAsyncAutoDestruct(true);
			if (modifiersPopUp->SetTargetForItems(Window()) == B_OK)
				modifiersPopUp->Go(ConvertToScreen(point), true);
		}
	} else if ((buttons & B_TERTIARY_MOUSE_BUTTON) != 0
		&& (fButtons & B_TERTIARY_MOUSE_BUTTON) == 0) {
		// tertiary mouse button, toggle the "deadness" of dead keys
		bool isEnabled = false;
		uint8 deadKey = fKeymap->DeadKey(key->code, fModifiers, &isEnabled);
		if (deadKey > 0) {
			fKeymap->SetDeadKeyEnabled(key->code, fModifiers, !isEnabled);
			_InvalidateKey(key);
		}
	} else {
		// primary mouse button
		if (fKeymap->IsModifierKey(key->code)) {
			if (_KeyState(key->code)) {
				uint32 modifier = fKeymap->Modifier(key->code);
				if ((modifier & modifiers()) == 0) {
					_SetKeyState(key->code, false);
					fModifiers &= ~modifier;
					Invalidate();
				}
			} else {
				_SetKeyState(key->code, true);
				fModifiers |= fKeymap->Modifier(key->code);
				Invalidate();
			}
 
			// TODO: if possible, we could handle the lock keys for real
		} else {
			_SetKeyState(key->code, true);
			_InvalidateKey(key);
		}
	}
 
	fButtons = buttons;
}
 
 
void
KeyboardLayoutView::MouseUp(BPoint point)
{
	Key* key = _KeyAt(fClickPoint);
 
	int32 buttons = 0;
	if (Looper() != NULL && Looper()->CurrentMessage() != NULL)
		Looper()->CurrentMessage()->FindInt32("buttons", &buttons);
 
	if (fKeymap == NULL || key == NULL) {
		fDragKey = NULL;
		return;
	}
 
	if ((buttons & B_SECONDARY_MOUSE_BUTTON) != 0
		|| ((buttons & B_PRIMARY_MOUSE_BUTTON) != 0
			&& (modifiers() & B_CONTROL_KEY) != 0)) {
		; // do nothing
	} else if ((buttons & B_TERTIARY_MOUSE_BUTTON) != 0
		&& (fButtons & B_TERTIARY_MOUSE_BUTTON) == 0) {
		// toggle the "deadness" of dead keys via middle mouse button
		_SetKeyState(key->code, false);
		_InvalidateKey(key);
		fButtons = buttons;
	} else {
		// primary mouse button
		fButtons = buttons;
 
		// modifier keys are sticky when used with the mouse
		if (fKeymap->IsModifierKey(key->code))
			return;
 
		_SetKeyState(key->code, false);
 
		if (_HandleDeadKey(key->code, fModifiers) && fDeadKey != 0)
			return;
 
		_InvalidateKey(key);
 
		if (fDragKey == NULL)
			_SendFakeKeyDown(key);
	}
 
	fDragKey = NULL;
}
 
 
void
KeyboardLayoutView::MouseMoved(BPoint point, uint32 transit,
	const BMessage* dragMessage)
{
	if (fKeymap == NULL)
		return;
 
	// prevent dragging for tertiary mouse button
	if ((fButtons & B_TERTIARY_MOUSE_BUTTON) != 0)
		return;
 
	if (dragMessage != NULL) {
		if (fEditable) {
			_InvalidateKey(fDropTarget);
			fDropPoint = point;
 
			_EvaluateDropTarget(point);
		}
 
		return;
	}
 
	int32 buttons;
	if (Window()->CurrentMessage() == NULL
		|| Window()->CurrentMessage()->FindInt32("buttons", &buttons) != B_OK
		|| buttons == 0) {
		return;
	}
 
	if (fDragKey != NULL || !(fabs(point.x - fClickPoint.x) > 4
		|| fabs(point.y - fClickPoint.y) > 4)) {
		return;
	}
 
	// start dragging
	Key* key = _KeyAt(fClickPoint);
	if (key == NULL)
		return;
 
	BRect frame = _FrameFor(key);
	BPoint offset = fClickPoint - frame.LeftTop();
	frame.OffsetTo(B_ORIGIN);
 
	BRect rect = frame;
	rect.right--;
	rect.bottom--;
	BBitmap* bitmap = new BBitmap(rect, B_RGBA32, true);
	bitmap->Lock();
 
	BView* view = new BView(rect, "drag", B_FOLLOW_NONE, 0);
	bitmap->AddChild(view);
 
	view->SetHighColor(0, 0, 0, 0);
	view->FillRect(view->Bounds());
	view->SetDrawingMode(B_OP_ALPHA);
	view->SetHighColor(0, 0, 0, 128);
	// set the level of transparency by value
	view->SetBlendingMode(B_CONSTANT_ALPHA, B_ALPHA_COMPOSITE);
	_DrawKey(view, frame, key, frame, false);
 
	view->Sync();
	bitmap->Unlock();
 
	BMessage drag(B_MIME_DATA);
	drag.AddInt32("key", key->code);
 
	char* string;
	int32 numBytes;
	fKeymap->GetChars(key->code, fModifiers, fDeadKey, &string,
		&numBytes);
	if (string != NULL) {
		drag.AddData("text/plain", B_MIME_DATA, string, numBytes);
		delete[] string;
	}
 
	DragMessage(&drag, bitmap, B_OP_ALPHA, offset);
	fDragKey = key;
	fDragModifiers = fModifiers;
 
	fKeyState[key->code / 8] &= ~(1 << (7 - (key->code & 7)));
	_InvalidateKey(key);
}
 
 
void
KeyboardLayoutView::Draw(BRect updateRect)
{
	if (fOldSize != BSize(Bounds().Width(), Bounds().Height())) {
		_InitOffscreen();
		_LayoutKeyboard();
	}
 
	BView* view;
	if (fOffscreenBitmap != NULL) {
		view = fOffscreenView;
		view->LockLooper();
	} else
		view = this;
 
	// Draw background
 
	if (Parent())
		view->SetLowColor(Parent()->ViewColor());
	else
		view->SetLowColor(ui_color(B_PANEL_BACKGROUND_COLOR));
 
	view->FillRect(updateRect, B_SOLID_LOW);
 
	// Draw keys
 
	for (int32 i = 0; i < fLayout->CountKeys(); i++) {
		Key* key = fLayout->KeyAt(i);
 
		_DrawKey(view, updateRect, key, _FrameFor(key),
			_IsKeyPressed(key->code));
	}
 
	// Draw LED indicators
 
	for (int32 i = 0; i < fLayout->CountIndicators(); i++) {
		Indicator* indicator = fLayout->IndicatorAt(i);
 
		_DrawIndicator(view, updateRect, indicator, _FrameFor(indicator->frame),
			(fModifiers & indicator->modifier) != 0);
	}
 
	if (fOffscreenBitmap != NULL) {
		view->Sync();
		view->UnlockLooper();
 
		DrawBitmapAsync(fOffscreenBitmap, BPoint(0, 0));
	}
}
 
 
void
KeyboardLayoutView::MessageReceived(BMessage* message)
{
	if (message->WasDropped() && fEditable && fDropTarget != NULL
		&& fKeymap != NULL) {
		int32 keyCode;
		const char* data;
		ssize_t size;
		if (message->FindData("text/plain", B_MIME_DATA,
				(const void**)&data, &size) == B_OK) {
			// Automatically convert UTF-8 escaped strings (for example from
			// CharacterMap)
			int32 dataSize = 0;
			uint8 buffer[16];
			if (size > 3 && data[0] == '\\' && data[1] == 'x') {
				char tempBuffer[16];
				if (size > 15)
					size = 15;
				memcpy(tempBuffer, data, size);
				tempBuffer[size] = '\0';
				data = tempBuffer;
 
				while (size > 3 && data[0] == '\\' && data[1] == 'x') {
					buffer[dataSize++] = strtoul(&data[2], NULL, 16);
					if ((buffer[dataSize - 1] & 0x80) == 0)
						break;
 
					size -= 4;
					data += 4;
				}
				data = (const char*)buffer;
			} else if ((data[0] & 0xc0) != 0x80 && (data[0] & 0x80) != 0) {
				// only accept the first character UTF-8 character
				while (dataSize < size && (data[dataSize] & 0x80) != 0) {
					dataSize++;
				}
			} else if ((data[0] & 0x80) == 0) {
				// an ASCII character
				dataSize = 1;
			} else {
				// no valid character
				beep();
				return;
			}
 
			int32 buttons;
			if (!message->IsSourceRemote()
				&& message->FindInt32("buttons", &buttons) == B_OK
				&& (buttons & B_PRIMARY_MOUSE_BUTTON) != 0
				&& message->FindInt32("key", &keyCode) == B_OK) {
				// switch keys if the dropped object came from us
				Key* key = _KeyForCode(keyCode);
				if (key == NULL
					|| (key == fDropTarget && fDragModifiers == fModifiers)) {
					return;
				}
 
				char* string;
				int32 numBytes;
				fKeymap->GetChars(fDropTarget->code, fModifiers, fDeadKey,
					&string, &numBytes);
				if (string != NULL) {
					// switch keys
					fKeymap->SetKey(fDropTarget->code, fModifiers, fDeadKey,
						(const char*)data, dataSize);
					fKeymap->SetKey(key->code, fDragModifiers, fDeadKey,
						string, numBytes);
					delete[] string;
				} else if (fKeymap->IsModifierKey(fDropTarget->code)) {
					// switch key with modifier
					fKeymap->SetModifier(key->code,
						fKeymap->Modifier(fDropTarget->code));
					fKeymap->SetKey(fDropTarget->code, fModifiers, fDeadKey,
						(const char*)data, dataSize);
				}
			} else {
				// Send the old key to the target, so it's not lost entirely
				_SendFakeKeyDown(fDropTarget);
 
				fKeymap->SetKey(fDropTarget->code, fModifiers, fDeadKey,
					(const char*)data, dataSize);
			}
		} else if (!message->IsSourceRemote()
			&& message->FindInt32("key", &keyCode) == B_OK) {
			// Switch an unmapped key
 
			Key* key = _KeyForCode(keyCode);
			if (key != NULL && key == fDropTarget)
				return;
 
			uint32 modifier = fKeymap->Modifier(keyCode);
 
			char* string;
			int32 numBytes;
			fKeymap->GetChars(fDropTarget->code, fModifiers, fDeadKey,
				&string, &numBytes);
			if (string != NULL) {
				// switch key with modifier
				fKeymap->SetModifier(fDropTarget->code, modifier);
				fKeymap->SetKey(keyCode, fDragModifiers, fDeadKey,
					string, numBytes);
				delete[] string;
			} else {
				// switch modifier keys
				fKeymap->SetModifier(keyCode,
					fKeymap->Modifier(fDropTarget->code));
				fKeymap->SetModifier(fDropTarget->code, modifier);
			}
 
			_InvalidateKey(fDragKey);
		}
 
		_InvalidateKey(fDropTarget);
		fDropTarget = NULL;
		fDropPoint.x = -1;
		return;
	}
 
	switch (message->what) {
		case B_UNMAPPED_KEY_DOWN:
		case B_UNMAPPED_KEY_UP:
			_KeyChanged(message);
			break;
 
		case B_MODIFIERS_CHANGED:
		{
			int32 newModifiers;
			if (message->FindInt32("modifiers", &newModifiers) == B_OK
				&& fModifiers != newModifiers) {
				fModifiers = newModifiers;
				_EvaluateDropTarget(fDropPoint);
				if (Window()->IsActive())
					Invalidate();
			}
			break;
		}
 
		default:
			BView::MessageReceived(message);
			break;
	}
}
 
 
void
KeyboardLayoutView::_InitOffscreen()
{
	delete fOffscreenBitmap;
	fOffscreenView = NULL;
 
	fOffscreenBitmap = new(std::nothrow) BBitmap(Bounds(),
		B_BITMAP_ACCEPTS_VIEWS, B_RGB32);
	if (fOffscreenBitmap != NULL && fOffscreenBitmap->IsValid()) {
		fOffscreenBitmap->Lock();
		fOffscreenView = new(std::nothrow) BView(Bounds(), "offscreen view",
			0, 0);
		if (fOffscreenView != NULL) {
			if (Parent() != NULL) {
				fOffscreenView->SetViewColor(Parent()->ViewColor());
			} else {
				fOffscreenView->SetViewColor(
					ui_color(B_PANEL_BACKGROUND_COLOR));
			}
 
			fOffscreenView->SetLowColor(fOffscreenView->ViewColor());
			fOffscreenBitmap->AddChild(fOffscreenView);
		}
		fOffscreenBitmap->Unlock();
	}
 
	if (fOffscreenView == NULL) {
		// something went wrong
		delete fOffscreenBitmap;
		fOffscreenBitmap = NULL;
	}
}
 
 
void
KeyboardLayoutView::_LayoutKeyboard()
{
	float factorX = Bounds().Width() / fLayout->Bounds().Width();
	float factorY = Bounds().Height() / fLayout->Bounds().Height();
 
	fFactor = min_c(factorX, factorY);
	fOffset = BPoint((Bounds().Width() - fLayout->Bounds().Width()
			* fFactor) / 2,
		(Bounds().Height() - fLayout->Bounds().Height() * fFactor) / 2);
 
	if (fLayout->DefaultKeySize().width < 11)
		fGap = 1;
	else
		fGap = 2;
 
	fOldSize.width = Bounds().Width();
	fOldSize.height = Bounds().Height();
}
 
 
void
KeyboardLayoutView::_DrawKeyButton(BView* view, BRect& rect, BRect updateRect,
	rgb_color base, rgb_color background, bool pressed)
{
	be_control_look->DrawButtonFrame(view, rect, updateRect, 4.0f, base,
		background, pressed ? BControlLook::B_ACTIVATED : 0);
	be_control_look->DrawButtonBackground(view, rect, updateRect, 4.0f,
		base, pressed ? BControlLook::B_ACTIVATED : 0);
}
 
 
void
KeyboardLayoutView::_DrawKey(BView* view, BRect updateRect, const Key* key,
	BRect rect, bool pressed)
{
	rgb_color base = key->dark ? kDarkColor : kBrightColor;
	rgb_color background = ui_color(B_PANEL_BACKGROUND_COLOR);
	rgb_color keyLabelColor = make_color(0, 0, 0, 255);
	key_kind keyKind = kNormalKey;
	int32 deadKey = 0;
	bool secondDeadKey = false;
	bool isDeadKeyEnabled = true;
 
	char text[32];
	if (fKeymap != NULL) {
		_GetKeyLabel(key, text, sizeof(text), keyKind);
		deadKey = fKeymap->DeadKey(key->code, fModifiers, &isDeadKeyEnabled);
		secondDeadKey = fKeymap->IsDeadSecondKey(key->code, fModifiers,
			fDeadKey);
	} else {
		// Show the key code if there is no keymap
		snprintf(text, sizeof(text), "%02" B_PRIx32, key->code);
	}
 
	_SetFontSize(view, keyKind);
 
	if (secondDeadKey)
		base = kSecondDeadKeyColor;
	else if (deadKey > 0 && isDeadKeyEnabled)
		base = kDeadKeyColor;
 
	if (key->shape == kRectangleKeyShape) {
		_DrawKeyButton(view, rect, updateRect, base, background, pressed);
 
		rect.InsetBy(1, 1);
 
		_GetAbbreviatedKeyLabelIfNeeded(view, rect, key, text, sizeof(text));
		be_control_look->DrawLabel(view, text, rect, updateRect,
			base, 0, BAlignment(B_ALIGN_CENTER, B_ALIGN_MIDDLE), &keyLabelColor);
	} else if (key->shape == kEnterKeyShape) {
		BRect topLeft = rect;
		BRect topRight = rect;
		BRect bottomLeft = rect;
		BRect bottomRight = rect;
 
		// TODO: for some reason, this does not always equal the bottom of
		// the other keys...
		bottomLeft.top = floorf(rect.top
			+ fLayout->DefaultKeySize().height * fFactor - fGap - 1);
		bottomLeft.right = floorf(rect.left
			+ (key->frame.Width() - key->second_row) * fFactor - fGap - 2);
 
		topLeft.bottom = bottomLeft.top;
		topLeft.right = bottomLeft.right + 1;
			// add one to make the borders meet
 
		topRight.bottom = topLeft.bottom;
		topRight.left = topLeft.right;
 
		bottomRight.top = bottomLeft.top;
		bottomRight.left = bottomLeft.right;
 
		// draw top left corner
		be_control_look->DrawButtonFrame(view, topLeft, updateRect,
			4.0f, 0.0f, 4.0f, 0.0f, base, background,
			pressed ? BControlLook::B_ACTIVATED : 0,
			BControlLook::B_LEFT_BORDER | BControlLook::B_TOP_BORDER
				| BControlLook::B_BOTTOM_BORDER);
		be_control_look->DrawButtonBackground(view, topLeft, updateRect,
			4.0f, 0.0f, 4.0f, 0.0f, base,
			pressed ? BControlLook::B_ACTIVATED : 0,
			BControlLook::B_LEFT_BORDER | BControlLook::B_TOP_BORDER
				| BControlLook::B_BOTTOM_BORDER);
 
		// draw top right corner
		be_control_look->DrawButtonFrame(view, topRight, updateRect,
			0.0f, 4.0f, 0.0f, 0.0f, base, background,
			pressed ? BControlLook::B_ACTIVATED : 0,
			BControlLook::B_TOP_BORDER | BControlLook::B_RIGHT_BORDER);
		be_control_look->DrawButtonBackground(view, topRight, updateRect,
			0.0f, 4.0f, 0.0f, 0.0f, base,
			pressed ? BControlLook::B_ACTIVATED : 0,
			BControlLook::B_TOP_BORDER | BControlLook::B_RIGHT_BORDER);
 
		// draw bottom right corner
		be_control_look->DrawButtonFrame(view, bottomRight, updateRect,
			0.0f, 0.0f, 4.0f, 4.0f, base, background,
			pressed ? BControlLook::B_ACTIVATED : 0,
			BControlLook::B_LEFT_BORDER | BControlLook::B_RIGHT_BORDER
				| BControlLook::B_BOTTOM_BORDER);
		be_control_look->DrawButtonBackground(view, bottomRight, updateRect,
			0.0f, 0.0f, 4.0f, 4.0f, base,
			pressed ? BControlLook::B_ACTIVATED : 0,
			BControlLook::B_LEFT_BORDER | BControlLook::B_RIGHT_BORDER
				| BControlLook::B_BOTTOM_BORDER);
 
		// clip out the bottom left corner
		bottomLeft.right += 1;
		bottomLeft.top -= 2;
		BRegion region(rect);
		region.Exclude(bottomLeft);
		view->ConstrainClippingRegion(&region);
 
		// Fill in the rect with the background color
		SetHighColor(background);
		FillRect(rect);
 
		// draw the button background
		BRect bgRect = rect.InsetByCopy(2, 2);
		be_control_look->DrawButtonBackground(view, bgRect, updateRect,
			4.0f, 4.0f, 0.0f, 4.0f, base,
			pressed ? BControlLook::B_ACTIVATED : 0);
 
		rect.left = bottomLeft.right;
		_GetAbbreviatedKeyLabelIfNeeded(view, rect, key, text, sizeof(text));
 
		// draw the button label
		be_control_look->DrawLabel(view, text, rect, updateRect,
			base, 0, BAlignment(B_ALIGN_CENTER, B_ALIGN_MIDDLE), &keyLabelColor);
 
		// reset the clipping region
		view->ConstrainClippingRegion(NULL);
	}
}
 
 
void
KeyboardLayoutView::_DrawIndicator(BView* view, BRect updateRect,
	const Indicator* indicator, BRect rect, bool lit)
{
	float rectTop = rect.top;
	rect.top += 2 * rect.Height() / 3;
 
	const char* label = NULL;
	if (indicator->modifier == B_CAPS_LOCK)
		label = "caps";
	else if (indicator->modifier == B_NUM_LOCK)
		label = "num";
	else if (indicator->modifier == B_SCROLL_LOCK)
		label = "scroll";
	if (label != NULL) {
		_SetFontSize(view, kIndicator);
 
		font_height fontHeight;
		GetFontHeight(&fontHeight);
		if (ceilf(rect.top - fontHeight.ascent + fontHeight.descent - 2)
				>= rectTop) {
			view->SetHighColor(0, 0, 0);
			view->SetLowColor(ViewColor());
 
			BString text(label);
			view->TruncateString(&text, B_TRUNCATE_END, rect.Width());
			view->DrawString(text.String(),
				BPoint(ceilf(rect.left + (rect.Width()
						- StringWidth(text.String())) / 2),
					ceilf(rect.top - fontHeight.descent - 2)));
		}
	}
 
	rect.left += rect.Width() / 4;
	rect.right -= rect.Width() / 3;
 
	rgb_color background = ui_color(B_PANEL_BACKGROUND_COLOR);
	rgb_color base = lit ? kLitIndicatorColor : kDarkColor;
 
	be_control_look->DrawButtonFrame(view, rect, updateRect, base,
		background, BControlLook::B_DISABLED);
	be_control_look->DrawButtonBackground(view, rect, updateRect,
		base, BControlLook::B_DISABLED);
}
 
 
const char*
KeyboardLayoutView::_SpecialKeyLabel(const key_map& map, uint32 code,
	bool abbreviated)
{
	if (code == map.caps_key) {
		return abbreviated
			? B_TRANSLATE_COMMENT("CAPS", "Very short for 'caps lock'")
			: B_TRANSLATE("CAPS LOCK");
	}
	if (code == map.scroll_key)
		return B_TRANSLATE("SCROLL");
	if (code == map.num_key) {
		return abbreviated
			? B_TRANSLATE_COMMENT("NUM", "Very short for 'num lock'")
			: B_TRANSLATE("NUM LOCK");
	}
	if (code == map.left_shift_key || code == map.right_shift_key)
		return B_TRANSLATE("SHIFT");
	if (code == map.left_command_key || code == map.right_command_key) {
		return abbreviated
			? B_TRANSLATE_COMMENT("CMD", "Very short for 'command'")
			: B_TRANSLATE("COMMAND");
	}
	if (code == map.left_control_key || code == map.right_control_key) {
		return abbreviated
			? B_TRANSLATE_COMMENT("CTRL", "Very short for 'control'")
			: B_TRANSLATE("CONTROL");
	}
	if (code == map.left_option_key || code == map.right_option_key) {
		return abbreviated
			? B_TRANSLATE_COMMENT("OPT", "Very short for 'option'")
			: B_TRANSLATE("OPTION");
	}
	if (code == map.menu_key)
		return B_TRANSLATE("MENU");
	if (code == B_PRINT_KEY)
		return B_TRANSLATE("PRINT");
	if (code == B_PAUSE_KEY)
		return B_TRANSLATE("PAUSE");
 
	return NULL;
}
 
 
const char*
KeyboardLayoutView::_SpecialMappedKeySymbol(const char* bytes, size_t numBytes)
{
	if (numBytes != 1)
		return NULL;
 
	if (bytes[0] == B_TAB)
		return "\xe2\x86\xb9";
	if (bytes[0] == B_ENTER)
		return "\xe2\x86\xb5";
	if (bytes[0] == B_BACKSPACE)
		return "\xe2\x8c\xab";
 
	if (bytes[0] == B_UP_ARROW)
		return "\xe2\x86\x91";
	if (bytes[0] == B_LEFT_ARROW)
		return "\xe2\x86\x90";
	if (bytes[0] == B_DOWN_ARROW)
		return "\xe2\x86\x93";
	if (bytes[0] == B_RIGHT_ARROW)
		return "\xe2\x86\x92";
 
	return NULL;
}
 
 
const char*
KeyboardLayoutView::_SpecialMappedKeyLabel(const char* bytes, size_t numBytes,
	bool abbreviated)
{
	if (numBytes != 1)
		return NULL;
	if (bytes[0] == B_ESCAPE)
		return B_TRANSLATE("ESC");
	if (bytes[0] == B_INSERT)
		return B_TRANSLATE("INS");
	if (bytes[0] == B_DELETE)
		return B_TRANSLATE("DEL");
	if (bytes[0] == B_HOME)
		return B_TRANSLATE("HOME");
	if (bytes[0] == B_END)
		return B_TRANSLATE("END");
	if (bytes[0] == B_PAGE_UP) {
		return abbreviated
			? B_TRANSLATE_COMMENT("PG \xe2\x86\x91",
				"Very short for 'page up'")
			: B_TRANSLATE("PAGE \xe2\x86\x91");
	}
	if (bytes[0] == B_PAGE_DOWN) {
		return abbreviated
			? B_TRANSLATE_COMMENT("PG \xe2\x86\x93",
				"Very short for 'page down'")
			: B_TRANSLATE("PAGE \xe2\x86\x93");
	}
 
	return NULL;
}
 
 
bool
KeyboardLayoutView::_FunctionKeyLabel(uint32 code, char* text, size_t textSize)
{
	if (code >= B_F1_KEY && code <= B_F12_KEY) {
		snprintf(text, textSize, "F%" B_PRId32, code + 1 - B_F1_KEY);
		return true;
	}
 
	return false;
}
 
 
void
KeyboardLayoutView::_GetAbbreviatedKeyLabelIfNeeded(BView* view, BRect rect,
	const Key* key, char* text, size_t textSize)
{
	if (floorf(rect.Width()) > ceilf(view->StringWidth(text)))
		return;
 
	// Check if we have a shorter version of this key
 
	const key_map& map = fKeymap->Map();
 
	const char* special = _SpecialKeyLabel(map, key->code, true);
	if (special != NULL) {
		strlcpy(text, special, textSize);
		return;
	}
 
	char* bytes = NULL;
	int32 numBytes;
	fKeymap->GetChars(key->code, fModifiers, fDeadKey, &bytes, &numBytes);
	if (bytes != NULL) {
		special = _SpecialMappedKeyLabel(bytes, numBytes, true);
		if (special != NULL)
			strlcpy(text, special, textSize);
 
		delete[] bytes;
	}
}
 
 
void
KeyboardLayoutView::_GetKeyLabel(const Key* key, char* text, size_t textSize,
	key_kind& keyKind)
{
	const key_map& map = fKeymap->Map();
	keyKind = kNormalKey;
	text[0] = '\0';
 
	const char* special = _SpecialKeyLabel(map, key->code);
	if (special != NULL) {
		strlcpy(text, special, textSize);
		keyKind = kSpecialKey;
		return;
	}
 
	if (_FunctionKeyLabel(key->code, text, textSize)) {
		keyKind = kSpecialKey;
		return;
	}
 
	char* bytes = NULL;
	int32 numBytes;
	fKeymap->GetChars(key->code, fModifiers, fDeadKey, &bytes, &numBytes);
	if (bytes != NULL) {
		special = _SpecialMappedKeyLabel(bytes, numBytes);
		if (special != NULL) {
			strlcpy(text, special, textSize);
			keyKind = kSpecialKey;
		} else {
			special = _SpecialMappedKeySymbol(bytes, numBytes);
			if (special != NULL) {
				strlcpy(text, special, textSize);
				keyKind = kSymbolKey;
			} else {
				bool hasGlyphs;
				fBaseFont.GetHasGlyphs(bytes, 1, &hasGlyphs);
				if (hasGlyphs)
					strlcpy(text, bytes, textSize);
			}
		}
 
		delete[] bytes;
	}
}
 
 
bool
KeyboardLayoutView::_IsKeyPressed(uint32 code)
{
	if (fDropTarget != NULL && fDropTarget->code == code)
		return true;
 
	return _KeyState(code);
}
 
 
bool
KeyboardLayoutView::_KeyState(uint32 code) const
{
	if (code >= 16 * 8)
		return false;
 
	return (fKeyState[code / 8] & (1 << (7 - (code & 7)))) != 0;
}
 
 
void
KeyboardLayoutView::_SetKeyState(uint32 code, bool pressed)
{
	if (code >= 16 * 8)
		return;
 
	if (pressed)
		fKeyState[code / 8] |= (1 << (7 - (code & 7)));
	else
		fKeyState[code / 8] &= ~(1 << (7 - (code & 7)));
}
 
 
Key*
KeyboardLayoutView::_KeyForCode(uint32 code)
{
	// TODO: have a lookup array
 
	for (int32 i = 0; i < fLayout->CountKeys(); i++) {
		Key* key = fLayout->KeyAt(i);
		if (key->code == code)
			return key;
	}
 
	return NULL;
}
 
 
void
KeyboardLayoutView::_InvalidateKey(uint32 code)
{
	_InvalidateKey(_KeyForCode(code));
}
 
 
void
KeyboardLayoutView::_InvalidateKey(const Key* key)
{
	if (key != NULL)
		Invalidate(_FrameFor(key));
}
 
 
/*!	Updates the fDeadKey member, and invalidates the view if needed.
 
	\return true if the view has been invalidated.
*/
bool
KeyboardLayoutView::_HandleDeadKey(uint32 key, int32 modifiers)
{
	if (fKeymap == NULL || fKeymap->IsModifierKey(key))
		return false;
 
	bool isEnabled = false;
	int32 deadKey = fKeymap->DeadKey(key, modifiers, &isEnabled);
	if (fDeadKey != deadKey && isEnabled) {
		fDeadKey = deadKey;
		Invalidate();
		return true;
	} else if (fDeadKey != 0) {
		fDeadKey = 0;
		Invalidate();
		return true;
	}
 
	return false;
}
 
 
void
KeyboardLayoutView::_KeyChanged(const BMessage* message)
{
	const uint8* state;
	ssize_t size;
	int32 key;
	if (message->FindInt32("key", &key) != B_OK
		|| message->FindData("states", B_UINT8_TYPE,
			(const void**)&state, &size) != B_OK) {
		return;
	}
 
	// Update key state, and invalidate change keys
 
	bool checkSingle = true;
 
	if (message->what == B_KEY_UP || message->what == B_UNMAPPED_KEY_UP) {
		if (_HandleDeadKey(key, fModifiers))
			checkSingle = false;
 
		if (_KeyForCode(key) == NULL)
			printf("no key for code %" B_PRId32 "\n", key);
	}
 
	for (int32 i = 0; i < 16; i++) {
		if (fKeyState[i] != state[i]) {
			uint8 diff = fKeyState[i] ^ state[i];
			fKeyState[i] = state[i];
 
			if (!checkSingle || !Window()->IsActive())
				continue;
 
			for (int32 j = 7; diff != 0; j--, diff >>= 1) {
				if (diff & 1) {
					_InvalidateKey(i * 8 + j);
				}
			}
		}
	}
}
 
 
Key*
KeyboardLayoutView::_KeyAt(BPoint point)
{
	// Find key candidate
 
	BPoint keyPoint = point;
	keyPoint -= fOffset;
	keyPoint.x /= fFactor;
	keyPoint.y /= fFactor;
 
	for (int32 i = fLayout->CountKeys() - 1; i >= 0; i--) {
		Key* key = fLayout->KeyAt(i);
		if (key->frame.Contains(keyPoint)) {
			BRect frame = _FrameFor(key);
			if (frame.Contains(point))
				return key;
 
			return NULL;
		}
	}
 
	return NULL;
}
 
 
BRect
KeyboardLayoutView::_FrameFor(BRect keyFrame)
{
	BRect rect;
	rect.left	= ceilf(keyFrame.left * fFactor);
	rect.top	= ceilf(keyFrame.top * fFactor);
	rect.right	= floorf((keyFrame.Width()) * fFactor + rect.left - fGap - 1);
	rect.bottom	= floorf((keyFrame.Height()) * fFactor + rect.top - fGap - 1);
	rect.OffsetBy(fOffset);
 
	return rect;
}
 
 
BRect
KeyboardLayoutView::_FrameFor(const Key* key)
{
	return _FrameFor(key->frame);
}
 
 
void
KeyboardLayoutView::_SetFontSize(BView* view, key_kind keyKind)
{
	BSize size = fLayout->DefaultKeySize();
	float fontSize = fBaseFontSize;
	if (fBaseFontHeight >= size.height * fFactor * 0.5) {
		fontSize *= (size.height * fFactor * 0.5) / fBaseFontHeight;
		if (fontSize < 8)
			fontSize = 8;
	}
 
	switch (keyKind) {
		case kNormalKey:
			fBaseFont.SetSize(fontSize);
			view->SetFont(&fBaseFont);
			break;
		case kSpecialKey:
			fSpecialFont.SetSize(fontSize * 0.7);
			view->SetFont(&fSpecialFont);
			break;
		case kSymbolKey:
			fSpecialFont.SetSize(fontSize * 1.6);
			view->SetFont(&fSpecialFont);
			break;
 
		case kIndicator:
		{
			BFont font;
			font.SetSize(fontSize * 0.8);
			view->SetFont(&font);
			break;
		}
	}
}
 
 
void
KeyboardLayoutView::_EvaluateDropTarget(BPoint point)
{
	fDropTarget = _KeyAt(point);
	if (fDropTarget != NULL) {
		if (fDropTarget == fDragKey && fModifiers == fDragModifiers)
			fDropTarget = NULL;
		else
			_InvalidateKey(fDropTarget);
	}
}
 
 
void
KeyboardLayoutView::_SendFakeKeyDown(const Key* key)
{
	BMessage message(B_KEY_DOWN);
	message.AddInt64("when", system_time());
	message.AddData("states", B_UINT8_TYPE, &fKeyState,
		sizeof(fKeyState));
	message.AddInt32("key", key->code);
	message.AddInt32("modifiers", fModifiers);
	message.AddPointer("keymap", fKeymap);
 
	char* string;
	int32 numBytes;
	fKeymap->GetChars(key->code, fModifiers, fDeadKey, &string,
		&numBytes);
	if (string != NULL) {
		message.AddString("bytes", string);
		delete[] string;
	}
 
	fKeymap->GetChars(key->code, 0, 0, &string, &numBytes);
	if (string != NULL) {
		message.AddInt32("raw_char", string[0]);
		message.AddInt8("byte", string[0]);
		delete[] string;
	}
 
	fTarget.SendMessage(&message);
}
 
 
BMenuItem*
KeyboardLayoutView::_CreateSwapModifiersMenuItem(uint32 modifier,
	uint32 displayModifier, uint32 oldCode, uint32 newCode)
{
	int32 mask = B_SHIFT_KEY | B_COMMAND_KEY | B_CONTROL_KEY | B_OPTION_KEY;
	const char* oldName = _NameForModifier(oldCode == 0x00 ? modifier
		: fKeymap->Modifier(oldCode) & ~mask, false);
	const char* newName = _NameForModifier(newCode == 0x00 ? modifier
		: fKeymap->Modifier(newCode) & ~mask, false);
 
	BMessage* message = new BMessage(kMsgUpdateModifierKeys);
	if (newName != NULL)
		message->AddUInt32(newName, oldCode);
 
	if (oldName != NULL)
		message->AddUInt32(oldName, newCode);
 
	if (oldCode == newCode)
		message->AddBool("unset", true);
 
	return new BMenuItem(_NameForModifier(displayModifier, true), message);
}
 
 
const char*
KeyboardLayoutView::_NameForModifier(uint32 modifier, bool pretty)
{
	if (modifier == B_CAPS_LOCK)
		return pretty ? B_TRANSLATE("Caps lock") : "caps_key";
	else if (modifier == B_NUM_LOCK)
		return pretty ? B_TRANSLATE("Num lock") : "num_key";
	else if (modifier == B_SCROLL_LOCK)
		return pretty ? B_TRANSLATE("Scroll lock") : "scroll_key";
	else if (modifier == B_SHIFT_KEY) {
		return pretty ? B_TRANSLATE_COMMENT("Shift", "Shift key")
			: "shift_key";
	} else if (modifier == B_LEFT_SHIFT_KEY)
		return pretty ? B_TRANSLATE("Left shift") : "left_shift_key";
	else if (modifier == B_RIGHT_SHIFT_KEY)
		return pretty ? B_TRANSLATE("Right shift") : "right_shift_key";
	else if (modifier == B_COMMAND_KEY) {
		return pretty ? B_TRANSLATE_COMMENT("Command", "Command key")
			: "command_key";
	} else if (modifier == B_LEFT_COMMAND_KEY)
		return pretty ? B_TRANSLATE("Left command") : "left_command_key";
	else if (modifier == B_RIGHT_COMMAND_KEY)
		return pretty ? B_TRANSLATE("Right command") : "right_command_key";
	else if (modifier == B_CONTROL_KEY) {
		return pretty ? B_TRANSLATE_COMMENT("Control", "Control key")
			: "control_key";
	} else if (modifier == B_LEFT_CONTROL_KEY)
		return pretty ? B_TRANSLATE("Left control") : "left_control_key";
	else if (modifier == B_RIGHT_CONTROL_KEY)
		return pretty ? B_TRANSLATE("Right control") : "right_control_key";
	else if (modifier == B_OPTION_KEY) {
		return pretty ? B_TRANSLATE_COMMENT("Option", "Option key")
			: "option_key";
	} else if (modifier == B_LEFT_OPTION_KEY)
		return pretty ? B_TRANSLATE("Left option") : "left_option_key";
	else if (modifier == B_RIGHT_OPTION_KEY)
		return pretty ? B_TRANSLATE("Right option") : "right_option_key";
	else if (modifier == B_MENU_KEY)
		return pretty ? B_TRANSLATE_COMMENT("Menu", "Menu key") : "menu_key";
 
	return NULL;
}