WidgetInput.cpp

/*
Copyright © 2011-2012 kitano

This file is part of FLARE.

FLARE is free software: you can redistribute it and/or modify it under the terms
of the GNU General Public License as published by the Free Software Foundation,
either version 3 of the License, or (at your option) any later version.

FLARE 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 General Public License for more details.

You should have received a copy of the GNU General Public License along with
FLARE.  If not, see http://www.gnu.org/licenses/
*/

#include "WidgetInput.h"
#include "SharedResources.h"
#include "Settings.h"
#include "SDL_gfxBlitFunc.h"

using namespace std;


WidgetInput::WidgetInput() {

	enabled = true;
	inFocus = false;
	pressed = false;
	hover = false;
	max_characters = 20;

	loadGraphics(mods->locate("images/menus/input.png"));

	// position
	pos.w = background->w;
	pos.h = background->h/2;

	cursor_frame = 0;

	render_to_alpha = false;

	color_normal = font->getColor("widget_normal");
}

void WidgetInput::loadGraphics(const string& filename) {

	// load input background image
	background = IMG_Load(filename.c_str());

	if(!background) {
		fprintf(stderr, "Couldn't load image: %s\n", IMG_GetError());
		SDL_Quit();
	}

	// optimize
	SDL_Surface *cleanup = background;
	background = SDL_DisplayFormatAlpha(background);
	SDL_FreeSurface(cleanup);

}

void WidgetInput::logic() {
	if (logic(inpt->mouse.x,inpt->mouse.y))
		return;
}

bool WidgetInput::logic(int x, int y) {
	Point mouse = {x,y};

	// Change the hover state
	if (isWithin(pos, mouse)) {
		hover = true;
	} else {
		hover = false;
	}

	if (checkClick()) {
		inFocus = true;
	}

	// if clicking elsewhere unfocus the text box
	if (inpt->pressing[MAIN1]) {
		if (!isWithin(pos, inpt->mouse)) {
			inFocus = false;
		}
	}

	if (inFocus) {

		if (inpt->inkeys != "") {
			// handle text input
			text += inpt->inkeys;
			if (text.length() > max_characters) {
				text = text.substr(0, max_characters);
			}
		}

		// handle backspaces
		if (!inpt->lock[DEL] && inpt->pressing[DEL]) {
			inpt->lock[DEL] = true;
			// remove utf-8 character
			int n = text.length()-1;
			while (n > 0 && ((text[n] & 0xc0) == 0x80) ) n--;
			text = text.substr(0, n);
		}

		// animate cursor
		// cursor visible one second, invisible the next
		cursor_frame++;
		if (cursor_frame == MAX_FRAMES_PER_SEC+MAX_FRAMES_PER_SEC) cursor_frame = 0;

	}
	return true;
}

void WidgetInput::render(SDL_Surface *target) {
	if (target == NULL) {
		target = screen;
	}

	SDL_Rect src;
	src.x = 0;
	src.y = 0;
	src.w = pos.w;
	src.h = pos.h;

	if (!inFocus)
		src.y = 0;
	else if (hover)
		src.y = pos.h;
	else
		src.y = pos.h;

	if (render_to_alpha)
		SDL_gfxBlitRGBA(background, &src, target, &pos);
	else
		SDL_BlitSurface(background, &src, target, &pos);

	if (!inFocus) {
		font->render(text, font_pos.x, font_pos.y, JUSTIFY_LEFT, target, color_normal);
	}
	else {
		if (cursor_frame < MAX_FRAMES_PER_SEC) {
			font->renderShadowed(text + "|", font_pos.x, font_pos.y, JUSTIFY_LEFT, target, color_normal);
		}
		else {
			font->renderShadowed(text, font_pos.x, font_pos.y, JUSTIFY_LEFT, target, color_normal);
		}
	}
}

void WidgetInput::setPosition(int x, int y) {
	pos.x = x;
	pos.y = y;

	font_pos.x = pos.x  + (font->getFontHeight()/2);
	font_pos.y = pos.y + (pos.h/2) - (font->getFontHeight()/2);
}

bool WidgetInput::checkClick() {

	// disabled buttons can't be clicked;
	if (!enabled) return false;

	// main button already in use, new click not allowed
	if (inpt->lock[MAIN1]) return false;

	// main click released, so the button state goes back to unpressed
	if (pressed && !inpt->lock[MAIN1]) {
		pressed = false;

		if (isWithin(pos, inpt->mouse)) {

			// activate upon release
			return true;
		}
	}

	pressed = false;

	// detect new click
	if (inpt->pressing[MAIN1]) {
		if (isWithin(pos, inpt->mouse)) {

			inpt->lock[MAIN1] = true;
			pressed = true;

		}
	}
	return false;
}

WidgetInput::~WidgetInput() {
	SDL_FreeSurface(background);
}