Kernel/GUI/WidgetEvents.cpp

/*
   This file is part of Fennix Kernel.

   Fennix Kernel is free software: you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation, either version 3 of
   the License, or (at your option) any later version.

   Fennix Kernel is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
*/

#include <gui.hpp>

#include <driver.hpp>
#include <task.hpp>
#include <printf.h>
#include <debug.h>

#include "../kernel.h"
#include "../DAPI.hpp"
#include "../Fex.hpp"

namespace GraphicalUserInterface
{
	void WidgetCollection::OnPaintBackground(Event *e)
	{
		UNUSED(e);
	}

	void WidgetCollection::OnPaintForeground(Event *e)
	{
		UNUSED(e);
		foreach (auto Panel in this->Panels)
		{
			PutRect(this->Buffer, Panel->rect, Panel->Color);
		}

		foreach (auto Label in this->Labels)
		{
			Label->CharCursorX = Label->rect.Left;
			Label->CharCursorY = Label->rect.Top;
			for (uint64_t i = 0; i < strlen(Label->Text); i++)
				PaintChar(this->CurrentFont, this->Buffer, Label->Text[i], 0xFFFFFF, &Label->CharCursorX, &Label->CharCursorY);
		}

		foreach (auto Button in this->Buttons)
		{
			if (Button->Pressed)
				PutRect(this->Buffer, Button->rect, Button->PressedColor);
			else if (Button->Hover)
				PutRect(this->Buffer, Button->rect, Button->HoverColor);
			else
				PutRect(this->Buffer, Button->rect, Button->Color);
			Button->CharCursorX = Button->rect.Left + (((Button->rect.Width / 2) - (this->CurrentFont->GetInfo().Width * strlen(Button->Text) / 2)));
			Button->CharCursorY = Button->rect.Top + (((Button->rect.Height / 2) - (this->CurrentFont->GetInfo().Height / 2)));
			for (uint64_t i = 0; i < strlen(Button->Text); i++)
				PaintChar(this->CurrentFont, this->Buffer, Button->Text[i], 0xFFFFFF, &Button->CharCursorX, &Button->CharCursorY);
		}
	}

	void WidgetCollection::OnPaint(Event *e)
	{
		static size_t LastWidth = 0;
		static size_t LastHeight = 0;

		if (LastWidth != ((Window *)this->ParentWindow)->GetPosition().Width ||
			LastHeight != ((Window *)this->ParentWindow)->GetPosition().Height)
		{
			LastWidth = ((Window *)this->ParentWindow)->GetPosition().Width;
			LastHeight = ((Window *)this->ParentWindow)->GetPosition().Height;

			this->mem->FreePages(this->Buffer->Data, TO_PAGES(this->Buffer->Size + 1));
			this->Buffer->Data = nullptr;
			delete this->Buffer, this->Buffer = nullptr;

			this->Buffer = new ScreenBitmap;
			this->Buffer->Width = LastWidth;
			this->Buffer->Height = LastHeight;
			this->Buffer->BitsPerPixel = Display->GetBitsPerPixel();
			this->Buffer->Pitch = Display->GetPitch();
			this->Buffer->Size = this->Buffer->Pitch * (size_t)LastHeight;
			this->Buffer->Data = (uint8_t *)this->mem->RequestPages(TO_PAGES(this->Buffer->Size + 1));
			memset(this->Buffer->Data, 0, this->Buffer->Size);

			this->NeedRedraw = true;
		}

		if (this->NeedRedraw)
		{
			memset(this->Buffer->Data, 0, this->Buffer->Size);
			this->OnPaintBackground(e);
			this->OnPaintForeground(e);
			this->NeedRedraw = false;
		}
		DrawOverBitmap(((Window *)this->ParentWindow)->GetBuffer(), this->Buffer, 0, 0);
	}

	void WidgetCollection::OnMouseDown(Event *e)
	{
		foreach (auto Button in this->Buttons)
		{
			if (Button->rect.Contains(e->MouseDown.X, e->MouseDown.Y))
			{
				if (e->MouseDown.Left)
				{
					debug("Button Hold");
					Button->Pressed = true;
					this->NeedRedraw = true;
				}
			}
		}
	}

	void WidgetCollection::OnMouseUp(Event *e)
	{
		foreach (auto Button in this->Buttons)
		{
			if (Button->rect.Contains(e->MouseUp.X, e->MouseUp.Y))
			{
				if (e->MouseUp.Left)
				{
					debug("Button Release");
					if (Button->Pressed)
					{
						debug("Button Clicked");
						if (Button->OnClick != (uintptr_t) nullptr)
							((void (*)(void))Button->OnClick)();

						Button->Pressed = false;
						this->NeedRedraw = true;
					}
				}
			}
		}
	}

	void WidgetCollection::OnMouseMove(Event *e)
	{
		foreach (auto Button in this->Buttons)
		{
			if (Button->rect.Contains(e->MouseMove.X, e->MouseMove.Y))
			{
				Button->Hover = true;
				this->NeedRedraw = true;
			}
			else
			{
				Button->Hover = false;
				this->NeedRedraw = true;
			}
		}
	}
}