Descent3/ui/UICombo.cpp

/*
 * $Logfile: /DescentIII/Main/ui/UICombo.cpp $
 * $Revision: 3 $
 * $Date: 4/14/99 1:52a $
 * $Author: Jeff $
 *
 * 
 *
 * $Log: /DescentIII/Main/ui/UICombo.cpp $
 * 
 * 3     4/14/99 1:52a Jeff
 * fixed case mismatched #includes
 * 
 * 2     3/03/99 2:45p Samir
 * use arrows up and down for combo boxes.
 * 
 * 1     9/02/98 6:49p Samir
 * New combo box
 *
 * $NoKeywords: $
 */

#include "UIlib.h"


//	----------------------------------------------------------------------------
//	UIComboBox
//		A listbox may contain text items, BUT only one will be visible
//		Allows the user to scroll through them too.

UIComboBox::UIComboBox()
{
	m_ItemList = NULL;
	m_nItems = 0;
	m_Index = 0;
	m_ShowUp = false;
	m_ShowDown = false;
	selectchange_fn = NULL;
}


UIComboBox::~UIComboBox()
{
}


//	creates a combo box
void UIComboBox::Create(UIWindow *parent, int id, int x, int y, int w, int h, int flags)
{
	m_ItemList = NULL;
	m_nItems = 0;
	m_Index = 0;
	m_ShowUp = false;
	m_ShowDown = false;
	selectchange_fn = NULL;
	m_scrolltimer = 0.0f;
	m_scrollstage = 0;

	UIGadget::Create(parent, id, x, y, w, h, flags);
	
	m_CX = 1;
	m_CY = 1;
	m_CX2 = m_W-1;
	m_CY2 = m_H-1;
}


void UIComboBox::AddItem(const UIItem *item)
{
	int i;

	if ((m_nItems % LISTBOX_BUFFER_SIZE) == 0) {
	//	dynamically allocated memory for listbox, expand as needed.
		UIItem **temp =  new UIItem *[m_nItems + LISTBOX_BUFFER_SIZE];
		if (m_ItemList) {
			for (i = 0; i < m_nItems; i++)
				temp[i] = m_ItemList[i];
			delete[] m_ItemList;
		}
		m_ItemList= temp;
	}

//	copy item passed to list.
	m_ItemList[m_nItems++] = (UIItem *)item;
}


// removes an item from the list.
void UIComboBox::RemoveItem(const UIItem *item)
{
	int i,j;
	
	for (i = 0; i < m_nItems; i++)
	{
		if (item == m_ItemList[i]) {
			for (j=i; j < (m_nItems-1); j++)
				m_ItemList[j] = m_ItemList[j+1];
			m_nItems--;
			break;
		}
	}
}


// empties combobox
void UIComboBox::RemoveAll()
{
	m_Index = m_nItems = 0;
}


// selects the given item in the list.
void UIComboBox::SelectItem(const UIItem *item)
{
	int i;
	
	for (i = 0; i < m_nItems; i++)
	{
		if (item == m_ItemList[i]) {
			SetSelectedIndex(i);
			break;
		}
	}
}


// returns the item at listbox index given.
UIItem *UIComboBox::GetItem(int index) const
{
	return (index < m_nItems) ? m_ItemList[index] : NULL;
}


// sets the selected index.
void UIComboBox::SetSelectedIndex(int index)
{
	if (index < m_nItems) {
		m_Index = index;
		if (selectchange_fn) 
			(*selectchange_fn)(index);
	}
}


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


//	called from outside gadget hierarchy.

void UIComboBox::OnDestroy()
{
	UIGadget::OnDestroy();

	if (m_ItemList)
		delete[] m_ItemList;

	m_ItemList = NULL;
}


// behavior when gadget is being drawn.
void UIComboBox::OnDraw()
{
	UITextItem uarrow;
	UITextItem darrow;
	char arrowbuf[2];

	if (m_Flags & UIF_BORDER)
		ui_DrawBox(GR_WHITE, 0,0,m_W,m_H);
	
//	draw all items in box that can be visible.
	int x=m_CX;
	int y=m_CY;

	if(!m_nItems) 
		return;

	sprintf(arrowbuf,"%c",UI_UP_ARROW_CHAR);
	uarrow = UITextItem(arrowbuf,m_ItemList[m_Index]->get_color(),255);
	sprintf(arrowbuf,"%c",UI_DOWN_ARROW_CHAR);
	darrow = UITextItem(arrowbuf,m_ItemList[m_Index]->get_color(),255);

	ui_SetTextClip(m_CX,m_CY,m_CX2, m_CY2);

//reset these
	m_ShowUp = m_ShowDown = false;
	m_ArrY = y;
	m_ArrH = uarrow.height();
	
	if (m_Index > 0) {
		m_UpArrX = m_CX;
		m_UpArrW = uarrow.width();
		uarrow.draw(m_UpArrX,m_ArrY);
		m_ShowUp = true;
	}
	if (m_Index < (m_nItems-1)) {
		m_DownArrX = m_CX2 - darrow.width();
		m_DownArrW = darrow.width();
		darrow.draw(m_DownArrX,m_ArrY);
		m_ShowDown = true;
	}

// draw current item.
	x = m_CX+uarrow.width()+2;
	ui_SetTextClip(x, m_CY, m_CX2 - darrow.width()-2, m_CY2);
	m_ItemList[m_Index]->draw(x, y);

	ui_ResetTextClip();
}


//	behavior when key is pressed.
void UIComboBox::OnKeyDown(int key)
{
	if (key == KEY_UP) {
		if (m_Index > 0) {
			UIComboBox::SetSelectedIndex(m_Index-1);
		}
	}
	else if (key == KEY_DOWN) {
		if (m_Index < (m_nItems-1)) {
			UIComboBox::SetSelectedIndex(m_Index+1);
		}
	}
}



// behavior when mouse button is pressed.
void UIComboBox::OnMouseBtnDown(int btn)
{
	if (btn == UILMSEBTN) {
		int mx = SCREEN_TO_GAD_X(this, UI_input.mx);
		int my = SCREEN_TO_GAD_Y(this, UI_input.my);

	// determine whether to accept mouse input at this time.
		if (m_scrollstage == 0) {
			m_scrollstage = 1;
		}
		else if (m_scrollstage == 1) {
			if ((m_scrolltimer-UI_TIME()) < KEYDOWN_FIRST_DELAY) 
				return;
			m_scrollstage = 2;
		}
		else if (m_scrollstage == 2) {
			if ((m_scrolltimer-UI_TIME()) < KEYDOWN_REPEAT_DELAY) 
				return;
		}
		m_scrolltimer = UI_TIME();

	// do mouse processing.
		if (m_ShowUp && PT_IN_RECT(mx,my,m_UpArrX, m_ArrY, m_UpArrW, m_ArrH)) {
			if (m_Index > 0) 
				UIComboBox::SetSelectedIndex(m_Index-1);
		}
		else if (m_ShowDown && PT_IN_RECT(mx,my,m_DownArrX, m_ArrY, m_DownArrW, m_ArrH)) {
			if (m_Index < (m_nItems-1)) 
				UIComboBox::SetSelectedIndex(m_Index+1);
		}
	}
}


// behavior when mouse button is released.
void UIComboBox::OnMouseBtnUp(int btn)
{
	if (btn == UILMSEBTN) {
		m_scrollstage = 0;
	}
}


void UIComboBox::OnSelect()
{
	UIGadget::OnSelect();
}