/src/WidgetLabel.cpp

  1/*
  2Copyright 2011 Clint Bellanger
  3
  4This file is part of FLARE.
  5
  6FLARE is free software: you can redistribute it and/or modify it under the terms
  7of the GNU General Public License as published by the Free Software Foundation,
  8either version 3 of the License, or (at your option) any later version.
  9
 10FLARE is distributed in the hope that it will be useful, but WITHOUT ANY
 11WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 12PARTICULAR PURPOSE.  See the GNU General Public License for more details.
 13
 14You should have received a copy of the GNU General Public License along with
 15FLARE.  If not, see http://www.gnu.org/licenses/
 16*/
 17
 18/**
 19 * class WidgetLabel
 20 *
 21 * A simple text display for menus
 22 */
 23
 24#include "WidgetLabel.h"
 25#include "SharedResources.h"
 26
 27using namespace std;
 28
 29
 30WidgetLabel::WidgetLabel() {
 31	
 32	text_buffer = NULL;
 33	text = "";
 34	color = FONT_WHITE;
 35	justify = JUSTIFY_LEFT;
 36	valign = VALIGN_TOP;
 37	
 38	bounds.x = bounds.y = 0;
 39	bounds.w = bounds.h = 0;
 40	
 41}
 42
 43/**
 44 * Draw the buffered string surface to the screen
 45 */
 46void WidgetLabel::render() {
 47
 48	SDL_Rect dest;
 49	dest.x = bounds.x;
 50	dest.y = bounds.y;
 51	dest.w = bounds.w;
 52	dest.h = bounds.h;
 53
 54	if (text_buffer != NULL) {
 55		SDL_BlitSurface(text_buffer, NULL, screen, &dest);		
 56	}
 57}
 58
 59
 60/**
 61 * A shortcut function to set all attributes simultaneously.
 62 */
 63void WidgetLabel::set(int _x, int _y, int _justify, int _valign, const string& _text, int _color) {
 64
 65	bool changed = false;
 66
 67	if (justify != _justify) {
 68		justify = _justify;
 69		changed = true;
 70	}
 71	if (valign != _valign) {
 72		valign = _valign;
 73		changed = true;
 74	}
 75	if (text != _text) {
 76		text = _text;
 77		changed = true;
 78	}
 79	if (color != _color) {
 80		color = _color;
 81		changed = true;
 82	}
 83	if (x_origin != _x) {
 84		x_origin = _x;
 85		changed = true;
 86	}
 87	if (y_origin != _y) {
 88		y_origin = _y;
 89		changed = true;
 90	}
 91	
 92	if (changed) {
 93		applyOffsets();
 94		refresh();
 95	}
 96}
 97
 98/**
 99 * Apply horizontal justify and vertical alignment to label position
100 */
101void WidgetLabel::applyOffsets() {
102
103	bounds.w = font->calc_width(text);
104	bounds.h = font->getFontHeight();
105
106	// apply JUSTIFY
107	if (justify == JUSTIFY_LEFT)
108		bounds.x = x_origin;
109	else if (justify == JUSTIFY_RIGHT)
110		bounds.x = x_origin - bounds.w;
111	else if (justify == JUSTIFY_CENTER)
112		bounds.x = x_origin - bounds.w/2;
113
114	// apply VALIGN
115	if (valign == VALIGN_TOP) {
116		bounds.y = y_origin;
117	}
118	else if (valign == VALIGN_BOTTOM) {
119		bounds.y = y_origin - bounds.h;;
120	}
121	else if (valign == VALIGN_CENTER) {
122		bounds.y = y_origin - bounds.h/2;
123	}
124	
125}
126
127/**
128 * Update the label text only
129 */
130void WidgetLabel::set(const string& _text) {
131	if (text != _text) {
132		this->text = _text;
133		applyOffsets();
134		refresh();
135	}
136}
137
138/**
139 * We buffer the rendered text instead of calculating it each frame
140 * This function refreshes the buffer.
141 */
142void WidgetLabel::refresh() {
143
144	SDL_FreeSurface(text_buffer);
145	text_buffer = createSurface(bounds.w, bounds.h);
146	font->renderShadowed(text, 0, 0, JUSTIFY_LEFT, text_buffer, color);
147	
148}
149
150
151WidgetLabel::~WidgetLabel() {
152	SDL_FreeSurface(text_buffer);
153}