Category : Files from Magazines
Archive   : DFPP01.ZIP
Filename : LISTBOX.CPP

// ------------ listbox.cpp

#include "listbox.h"
#include "keyboard.h"

// ----------- common constructor code
void ListBox::OpenWindow()
{
windowtype = ListboxWindow;
if (windowstate == CLOSED)
TextBox::OpenWindow();
selection = -1;
addmode = False;
anchorpoint = -1;
selectcount = 0;
SetColors();
}

// -------- set the fg/bg colors for the window
void ListBox::SetColors()
{
colors.fg = YELLOW;
colors.bg = BLUE;
colors.sfg = LIGHTGRAY;
colors.sbg = BLACK;
colors.ffg = LIGHTGRAY;
colors.fbg = BLUE;
colors.hfg = BLACK;
colors.hbg = LIGHTGRAY;
}

void ListBox::CloseWindow()
{
TextBox::CloseWindow();
}

void ListBox::ClearSelection()
{
if (selection != -1)
WriteTextLine(selection, colors.fg, colors.bg);
}

void ListBox::SetSelection(int sel)
{
ClearSelection();
if (sel >= 0 && sel < wlines) {
selection = sel;
WriteTextLine(sel, colors.sfg, colors.sbg);
}
}

void ListBox::Keyboard(int key)
{
int sel = selection; // (ClearSelection changes selection)
switch (key) {
case UP:
if (sel > 0) {
ClearSelection();
if (sel == wtop)
ScrollDown();
SetSelection(sel-1);
}
return;
case DN:
if (sel < wlines-1) {
ClearSelection();
if (sel == wtop+ClientHeight()-1)
ScrollUp();
SetSelection(sel+1);
}
return;
case '\r':
Choose();
return;
default:
break;
}
TextBox::Keyboard(key);
}

// ---------- paint the listbox
void ListBox::Paint()
{
TextBox::Paint();
if (text != NULL)
WriteTextLine(selection, colors.sfg, colors.sbg);
}

void ListBox::ScrollUp()
{
TextBox::ScrollUp();
WriteTextLine(selection, colors.sfg, colors.sbg);
}

void ListBox::ScrollDown()
{
TextBox::ScrollDown();
WriteTextLine(selection, colors.sfg, colors.sbg);
}

void ListBox::ScrollRight()
{
TextBox::ScrollRight();
WriteTextLine(selection, colors.sfg, colors.sbg);
}

void ListBox::ScrollLeft()
{
TextBox::ScrollLeft();
WriteTextLine(selection, colors.sfg, colors.sbg);
}

void ListBox::PageUp()
{
TextBox::PageUp();
WriteTextLine(selection, colors.sfg, colors.sbg);
}

void ListBox::PageDown()
{
TextBox::PageDown();
WriteTextLine(selection, colors.sfg, colors.sbg);
}

void ListBox::PageRight()
{
TextBox::PageRight();
WriteTextLine(selection, colors.sfg, colors.sbg);
}

void ListBox::PageLeft()
{
TextBox::PageLeft();
WriteTextLine(selection, colors.sfg, colors.sbg);
}

// ---------- Left mouse button was clicked
void ListBox::LeftButton(int mx, int my)
{
if (my != prevmouseline) {
if (ClientRect().Inside(mx, my)) {
int y = my - ClientTop();
if (wlines && y < wlines-wtop)
SetSelection(wtop+y);
}
}
DFWindow::LeftButton(mx, my);
}

void ListBox::DoubleClick(int mx, int my)
{
if (ClientRect().Inside(mx, my)) {
my -= ClientTop();
if (wlines && my < wlines-wtop)
Choose();
}
DFWindow::DoubleClick(mx, my);
}

void ListBox::ButtonReleased(int, int)
{
prevmouseline = -1;
}

void ListBox::Choose()
{
// --- does nothing yet
}