wg_button.cpp

一个小巧的嵌入式图形系统wGUI, 可以用VC编译

// wg_button.cpp
//
// CButton class implementation
//
//
// Copyright (c) 2002 Rob Wiskow
// [e-mail]
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//


#include "wgui_include_config.h"
#include "wg_button.h"
#include "wg_application.h"
#include "wg_message_server.h"
#include <algorithm>


namespace wGui
{

CButton::CButton(const CRect& WindowRect, CWindow* pParent, std::string sText, CFontEngine* pFontEngine) :
	CWindow(WindowRect, pParent),
	m_eButtonState(UP),
	m_MouseButton(0)
{
  m_sClassName = "CButton";
	m_sWindowText = sText;
	if (pFontEngine)
	{
		m_pFontEngine = pFontEngine;
	}
	else
	{
		m_pFontEngine = CApplication::Instance()->GetDefaultFontEngine();
	}
	std::auto_ptr<CRenderedString> pRenderedString(new CRenderedString(
		m_pFontEngine, sText, CRenderedString::VALIGN_CENTER, CRenderedString::HALIGN_CENTER));
	m_pRenderedString = pRenderedString;
	m_BGColor = DEFAULT_FG_COLOR;
	CMessageServer::Instance().RegisterMessageClient(this, CMessage::MOUSE_BUTTONUP);
}


CButton::~CButton(void)
{

}


void CButton::SetButtonState(EState eState)
{
	if (m_eButtonState != eState)
	{
		m_eButtonState = eState;
		StartDrawProc();
	}
}


void CButton::Draw(void) const
{
	CWindow::Draw();

	CPoint FontCenterPoint = m_WindowRect.Center();
	CRect SubRect(m_WindowRect);
	SubRect.Grow(-1);
	CPainter Painter(m_pSDLSurface);
	Painter.DrawRect(m_WindowRect, false, COLOR_BLACK);
	CRGBColor FontColor = DEFAULT_LINE_COLOR;
	switch (m_eButtonState)
	{
	case UP:
		Painter.DrawRect(SubRect, false, COLOR_LIGHTGRAY);
		Painter.DrawHLine(SubRect.Left(), SubRect.Right(), SubRect.Bottom(), COLOR_DARKGRAY);
		Painter.DrawVLine(SubRect.Top(), SubRect.Bottom(), SubRect.Right(), COLOR_DARKGRAY);
		break;
	case DOWN:
		Painter.DrawRect(SubRect, false, COLOR_LIGHTGRAY);
		Painter.DrawHLine(SubRect.Left(), SubRect.Right(), SubRect.Top(), COLOR_DARKGRAY);
		Painter.DrawVLine(SubRect.Top(), SubRect.Bottom(), SubRect.Left(), COLOR_DARKGRAY);
		FontCenterPoint = FontCenterPoint + CPoint(1, 1);
		break;
	case DISABLED:
		FontColor = DEFAULT_DISABLED_LINE_COLOR;
		break;
	default:
		break;
	}
	SubRect.Grow(-2);
	m_pRenderedString->Draw(m_pSDLSurface, SubRect, FontCenterPoint, FontColor);
}


void CButton::SetWindowText(const std::string& sWindowText)
{
	CWindow::SetWindowText(sWindowText);
	std::auto_ptr<CRenderedString> pRenderedString(new CRenderedString(
		m_pFontEngine, sWindowText, CRenderedString::VALIGN_CENTER, CRenderedString::HALIGN_CENTER));
	m_pRenderedString = pRenderedString;
	StartDrawProc();
}


bool CButton::OnMouseButtonDown(CPoint Point, unsigned int Button)
{
	bool bResult = false;

 	if (! CWindow::OnMouseButtonDown(Point, Button) && m_bVisible && (m_WindowRect.HitTest(Point) == CRect::RELPOS_INSIDE) &&
		(m_eButtonState == UP))
	{
		SetButtonState(DOWN);
		m_MouseButton = Button;
		bResult = true;
	}

	return bResult;
}


bool CButton::OnMouseButtonUp(CPoint Point, unsigned int Button)
{
	bool bResult = false;

	if (! CWindow::OnMouseButtonUp(Point, Button) && m_bVisible && (m_WindowRect.HitTest(Point) == CRect::RELPOS_INSIDE) &&
		(m_eButtonState == DOWN) && (m_MouseButton == Button))
	{
		CMessage::EMessageType MessageType =  CMessage::UNKNOWN;
		switch (m_MouseButton)
		{
		case CMouseMessage::LEFT:
			MessageType = CMessage::CTRL_LCLICK;
			break;
		case CMouseMessage::RIGHT:
			MessageType = CMessage::CTRL_RCLICK;
			break;
		case CMouseMessage::MIDDLE:
			MessageType = CMessage::CTRL_MCLICK;
			break;
		}
		CMessageServer::Instance().QueueMessage(new TIntMessage(MessageType, m_pParentWindow, this, 0));
		bResult = true;
	}

	return bResult;
}


bool CButton::HandleMessage(CMessage* pMessage)
{
	bool bHandled = false;

	if (pMessage)
	{
		switch(pMessage->MessageType())
		{
		case CMessage::MOUSE_BUTTONUP:
		{
			CMouseMessage* pMouseMessage = dynamic_cast<CMouseMessage*>(pMessage);
			if (pMouseMessage && m_eButtonState == DOWN)
			{
				SetButtonState(UP);
				bHandled = true;
			}
			break;
		}
		default :
			bHandled = CWindow::HandleMessage(pMessage);
			break;
		}
	}

	return bHandled;
}


CPictureButton::CPictureButton(const CRect& WindowRect, CWindow* pParent, std::string sPictureFile) :
	CButton(WindowRect, pParent, sPictureFile, 0)
{
  m_sClassName = "CPictureButton";
	std::auto_ptr<CBitmapResourceHandle> phBitmap(new CBitmapFileResourceHandle(sPictureFile));
	m_phBitmap = phBitmap;
}


CPictureButton::CPictureButton(const CRect& WindowRect, CWindow* pParent, const CBitmapResourceHandle& hBitmap) :
	CButton(WindowRect, pParent, "<bitmap>", 0)
{
  m_sClassName = "CPictureButton";
	std::auto_ptr<CBitmapResourceHandle> phBitmap(new CBitmapResourceHandle(hBitmap));
	m_phBitmap = phBitmap;
}


CPictureButton::~CPictureButton(void)
{

}


void CPictureButton::SetPicture(std::string sPictureFile)
{
	SetPicture(CBitmapFileResourceHandle(sPictureFile));
}


void CPictureButton::SetPicture(const CBitmapResourceHandle& hBitmap)
{
	std::auto_ptr<CBitmapResourceHandle> phBitmap(new CBitmapResourceHandle(hBitmap));
	m_phBitmap = phBitmap;
	StartDrawProc();
}


void CPictureButton::Draw(void) const
{
	CWindow::Draw();

	CRect SubRect(m_WindowRect);
	SubRect.Grow(-1);
	CPainter Painter(m_pSDLSurface);
	Painter.DrawRect(m_WindowRect, false, COLOR_BLACK);
	switch (m_eButtonState)
	{
	case UP:
		Painter.DrawRect(SubRect, false, COLOR_LIGHTGRAY);
		Painter.DrawHLine(SubRect.Left(), SubRect.Right(), SubRect.Bottom(), COLOR_DARKGRAY);
		Painter.DrawVLine(SubRect.Top(), SubRect.Bottom(), SubRect.Right(), COLOR_DARKGRAY);
		break;
	case DOWN:
		Painter.DrawRect(SubRect, false, COLOR_LIGHTGRAY);
		Painter.DrawHLine(SubRect.Left(), SubRect.Right(), SubRect.Top(), COLOR_DARKGRAY);
		Painter.DrawVLine(SubRect.Top(), SubRect.Bottom(), SubRect.Left(), COLOR_DARKGRAY);
		SubRect = SubRect + CPoint(1, 1);
		break;
	case DISABLED:
		break;
	default:
		break;
	}
	SubRect.Grow(-1);
	SDL_Rect SourceRect;
	SourceRect.x = static_cast<short int>((m_phBitmap->Bitmap()->w - SubRect.Width()) / 2 < 0 ? 0 : (m_phBitmap->Bitmap()->w - SubRect.Width()) / 2);
	SourceRect.y = static_cast<short int>((m_phBitmap->Bitmap()->h - SubRect.Height()) / 2 < 0 ? 0 : (m_phBitmap->Bitmap()->w - SubRect.Height()) / 2);
	SourceRect.w = static_cast<short int>(std::min(SubRect.Width(), m_phBitmap->Bitmap()->w));
	SourceRect.h = static_cast<short int>(std::min(SubRect.Height(), m_phBitmap->Bitmap()->h));
	SDL_Rect DestRect;
	DestRect.x = static_cast<short int>((SubRect.Width() - m_phBitmap->Bitmap()->w) / 2 < 0 ? SubRect.Left() : SubRect.Left() + (SubRect.Width() - m_phBitmap->Bitmap()->w) / 2);
	DestRect.y = static_cast<short int>((SubRect.Height() - m_phBitmap->Bitmap()->h) / 2 < 0 ? SubRect.Top() : SubRect.Top() + (SubRect.Height() - m_phBitmap->Bitmap()->h) / 2);
	DestRect.w = static_cast<short int>(std::min(SubRect.Width(), m_phBitmap->Bitmap()->w));
	DestRect.h = static_cast<short int>(std::min(SubRect.Height(), m_phBitmap->Bitmap()->h));
	SDL_BlitSurface(m_phBitmap->Bitmap(), &SourceRect, m_pSDLSurface, &DestRect);
}

}