Descent3/ui/UISlider.cpp

/*
 * $Logfile: /DescentIII/Main/ui/UISlider.cpp $
 * $Revision: 10 $
 * $Date: 4/14/99 1:53a $
 * $Author: Jeff $
 *
 *	Slider code
 *
 * $Log: /DescentIII/Main/ui/UISlider.cpp $
 * 
 * 10    4/14/99 1:53a Jeff
 * fixed case mismatched #includes
 * 
 * 9     12/02/98 11:45a Samir
 * small fixes to slider control.
 * 
 * 8     10/19/98 6:30p Jeff
 * changes made for detail variables.  Put in preset values.  Preset
 * options.  Removed terrain_cast from detail.  Put new callbacks in
 * UIListBox and UISlider
 * 
 * 7     9/01/98 4:33p Samir
 * improved mouse handling of sliders.
 * 
 * 6     3/10/98 7:25p Samir
 * Allow customization of visual slider.
 * 
 * 5     3/04/98 12:08p Samir
 * Slider fixed.
 * 
 * 4     1/30/98 7:05p Samir
 * Each gadget now has their own coordinate system.
 * 
 * 3     1/18/98 4:24p Samir
 * Fixed up scrolling sliders.
 * 
 * 2     1/13/98 4:28p Samir
 * Added sliders.
 * 
 * 1     1/09/98 12:00p Samir
 * Initial revision
 * 
 * $NoKeywords: $
 */


#include "UIlib.h"


//	Construction and destruction

UISlider::UISlider()
{
	switch_item = slider_item = NULL;	
	selectchange_fn = NULL;
	selectchange_id_fn = NULL;
	m_callbackptr = NULL;
}


UISlider::~UISlider()
{

}

#define SLIDER_BUTTON_WIDTH (switch_item->width() ? switch_item->width() : 16)
#define SLIDER_BUTTON_HEIGHT (switch_item->height() ? switch_item->height() : 16)

void UISlider::Create(UIWindow *parent, int id, int x, int y, int w, int h, int flags)
{
	ASSERT(w > 0);

	m_Pos = 0;
	m_Range = 1;
	selectchange_fn = NULL;
	selectchange_id_fn = NULL;
	m_callbackptr = NULL;

	switch_item = UIPrimativeItem(GR_DARKGRAY).CopyUIItem();
	slider_item = UIPrimativeItem(GR_DARKGRAY).CopyUIItem();

	UIGadget::Create(parent, id, x, y, w, h, flags);
}


//	sets visual characteristics of slider.
void UISlider::SetSliderSwitchItem(UIItem *item)
{
	if (switch_item)
		delete switch_item;

	if (item) {
		switch_item = item->CopyUIItem();
	}
	else 
		switch_item = UIPrimativeItem(GR_DARKGRAY).CopyUIItem();
}


void UISlider::SetSliderItem(UIItem *item)
{
	if (slider_item)
		delete slider_item;

	if (item) {
		slider_item = item->CopyUIItem();
	}
	else 
		slider_item = UIPrimativeItem(GR_DARKGRAY).CopyUIItem();
}


//	settings

void UISlider::SetRange(int range)
{
	ASSERT(range > 0);

	m_Range = range;
	m_IntervalWidth = ((float)m_PixelWidth)/((float)m_Range);
}


//	called from outside gadget hierarchy.

// override: called when resized or before drawing.
void UISlider::OnFormat()
{
	if (slider_item->width() == 0) 
		m_W = GetSavedW();
	else 
		m_W = slider_item->width();

	if (switch_item->height() == 0) 
		m_H = GetSavedH();
	else
		m_H = switch_item->height();

	m_PixelWidth = m_W - SLIDER_BUTTON_WIDTH;
	m_IntervalWidth = ((float)m_PixelWidth)/((float)m_Range);
	switch_w = SLIDER_BUTTON_WIDTH;
	switch_h = SLIDER_BUTTON_HEIGHT;

	UIGadget::OnFormat();
}


// behavior when gadget is being destroyed.
void UISlider::OnDestroy()
{
	if (slider_item)
		delete slider_item;
	if (switch_item)
		delete switch_item;
}


// behavior when gadget is being drawn.
void UISlider::OnDraw()
{
//	draw the slider region and the slider switch
	switch_x = (int)((float)m_Pos*(float)m_IntervalWidth);
	switch_y = 0;
	
	if (slider_item->width())
		slider_item->draw(0, switch_y+(SLIDER_BUTTON_HEIGHT/2)-slider_item->height()/2);
	else
		slider_item->draw(0, switch_y+(SLIDER_BUTTON_HEIGHT/2)-1, m_W, 3);

	if (switch_item->width())
		switch_item->draw(switch_x, switch_y);
	else
		switch_item->draw(switch_x, switch_y, SLIDER_BUTTON_WIDTH, SLIDER_BUTTON_HEIGHT);
}


//	behavior when key is pressed.
void UISlider::OnKeyDown(int key)
{
	if (key == KEY_LEFT && m_Pos > 0) {
		m_Pos--;
		OnSelect();
	}
	else if (key == KEY_RIGHT && m_Pos < m_Range) {
		m_Pos++;
		OnSelect();
	}
}


// behavior when key is released.
void UISlider::OnKeyUp(int key)
{
}


// behavior when mouse button is pressed.
void UISlider::OnMouseBtnDown(int btn)
{
	if (btn == UILMSEBTN) {
		int x,new_pos;						// within gadget.
	//	determine where in slider the new switch should go.
		LOCK_FOCUS(this);
		x = SCREEN_TO_GAD_X(this, UI_input.mx);
		if (x<0) x = 0;
		if (x>m_W) x = m_W;
		new_pos = (int)(((float)x)/((float)m_IntervalWidth));
		if (new_pos < 0) 
			new_pos = 0;
		else if (new_pos >=m_Range)
			new_pos = m_Range-1;
		if (new_pos != m_Pos) { 
		//	mprintf((0, "x=%d, interval=%d, pos=%d\n", x, m_IntervalWidth, new_pos));
			OnSelect();
		}
		m_Pos = new_pos;
	}

}


// behavior when mouse button is released.
void UISlider::OnMouseBtnUp(int btn)
{
	if (btn == UILMSEBTN)
		UNLOCK_FOCUS(this);
}

void UISlider::OnSelect()
{
	if(selectchange_fn){
		(*selectchange_fn)(m_Pos);
	}

	if(selectchange_id_fn){
		(*selectchange_id_fn)(GetID(),m_callbackptr);
	}

	UIGadget::OnSelect();
}

void UISlider::SetSelectChangeCallback(void (*fn)(int))
{
	selectchange_fn = fn;
}

void UISlider::SetSelectChangeCallback(void (*fn)(int,void *),void *ptr)
{
	selectchange_id_fn = fn;
	m_callbackptr = ptr;
}