haiku/src/servers/app/server/RootLayer.cpp

//------------------------------------------------------------------------------
//	Copyright (c) 2001-2003, OpenBeOS
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//
//	File Name:		RootLayer.cpp
//	Author:			Gabe Yoder <gyoder@stny.rr.com>
//					DarkWyrm <bpmagic@columbus.rr.com>
//	Description:	Class used for the top layer of each workspace's Layer tree
//  
//------------------------------------------------------------------------------
#include <View.h>
#include "RootLayer.h"
#include "Desktop.h"

/*!
	\brief Sets up internal variables needed by the RootLayer
	\param frame 
	\param name 
*/
RootLayer::RootLayer(BRect rect, const char *layername)
	: Layer(rect,layername,B_FOLLOW_NONE,0, NULL)
{
	_driver=GetGfxDriver();
	_invalid=new BRegion(Bounds());
	_is_dirty=true;
}

/*!
	\brief Frees all allocated heap memory (which happens to be none) ;)
*/
RootLayer::~RootLayer()
{
}

/*!
	\brief Requests that the layer be drawn on screen
	\param r The bounding rectangle of the area given in the Layer's coordinates
*/
void RootLayer::RequestDraw(const BRect &r)
{
  /*
     1) call the display driver's FillRect on the rectangle, filling with the layer's background color
2) recurse through each child and call its RequestDraw() function if it intersects the child's frame
*/
}

/*!
	\brief Requests that the layer be drawn on screen
*/
void RootLayer::RequestDraw(void)
{
	if(!_is_dirty)
		return;
	
	// Redraw the base
	for(int32 i=0; _invalid->CountRects();i++)
	{
		if(_invalid->RectAt(i).IsValid())
			_driver->FillRect(_invalid->RectAt(i),_layerdata, 0LL);
		else
			break;
	}

	delete _invalid;
	_invalid=NULL;
	_is_dirty=false;

	// force redraw of all dirty windows	
	for(Layer *lay=_topchild; lay!=NULL; lay=lay->_lowersibling)
	{
		if(lay->IsDirty())
			lay->RequestDraw(lay->Bounds());
	}

}

/*!
	\brief Sets the background color of the Screen
	\param col The new background color
*/
void RootLayer::SetColor(const RGBColor &col)
{
	_layerdata->lowcolor=col;
}

/*!
	\brief Returns the background color of the Screen
	\return The background color
*/
RGBColor RootLayer::GetColor(void) const
{	
	return _layerdata->lowcolor;
}

//! Empty function to disable moving the RootLayer
void RootLayer::MoveBy(float x, float y)
{
}

//! Empty function to disable moving the RootLayer
void RootLayer::MoveBy(BPoint pt)
{
}

//! Reimplemented for RootLayer special case
void RootLayer::ResizeBy(float x, float y)
{
	BRect oldframe=_frame;
	_frame.right+=x;
	_frame.bottom+=y;

	// We'll need to rebuild the regions of the child layers
	// because resizing will affect the visible regions
	RebuildRegions(true);
	
	// If we've gotten bigger, we'll need to repaint the new areas
	if(x>0)
	{
		BRect dx(oldframe.right,oldframe.top, _frame.right, _frame.bottom);
		Invalidate(dx);
	}
	if(y>0)
	{
		BRect dy(oldframe.left,oldframe.bottom, _frame.right, _frame.bottom);
		Invalidate(dy);
	}
}

//! Reimplemented for RootLayer special case
void RootLayer::ResizeBy(BPoint pt)
{
	ResizeBy(pt.x,pt.y);
}

/*!
	\brief Assigns a particular display driver to the RootLayer
	\param d The new display driver (ignored if NULL)
*/
void RootLayer::SetDriver(DisplayDriver *driver)
{
}

/*!
	\brief Rebuilds the visible and invalid layers based on the layer hierarchy
	\param recursive (Defaults to false)
*/
void RootLayer::RebuildRegions(bool recursive)
{
  /*
     1) get the frame
2) set full and visible regions to frame
3) iterate through each child and exclude its full region from the visible region if the child is visible.
     */
}