TextWidget.cpp

00001 #include "TextWidget.h"
00002 
00003 /**
00004 * A basic widget implementation which just draws some text.
00005 * If the text does not fit in the bounding-box it will be clipped
00006 **/
00007 TextWidget::TextWidget(GraphicsContext *context) :
00008     Widget(context),
00009     _text(NULL),
00010     _renderer(context->fontRenderer()),
00011     _font(context->defaultFont()),
00012     _halign(LEFT), _valign(TOP)
00013 {
00014 }
00015 
00016 TextWidget::TextWidget(GraphicsContext *context, FontRenderer* renderer) :
00017     Widget(context),
00018     _text(NULL),
00019     _renderer(renderer),
00020     _font(context->defaultFont()),
00021     _halign(LEFT), _valign(TOP)
00022 {
00023 }
00024 
00025 TextWidget::TextWidget(GraphicsContext *context, FontRenderer* renderer, Font* font) :
00026     Widget(context),
00027     _text(NULL),
00028     _renderer(renderer),
00029     _font(font),
00030     _halign(LEFT), _valign(TOP)
00031 {
00032 }
00033 
00034 void TextWidget::setText(char* text)
00035 {
00036     _text = text;
00037     dirty();
00038 }
00039 
00040 void TextWidget::setFont(Font* font)
00041 {
00042     _font = font;
00043     dirty();
00044 }
00045 
00046 Font *TextWidget::getFont() {
00047     return _font;
00048 }
00049 
00050 void TextWidget::setHAlign(HAlign alignment) {
00051     _halign = alignment;
00052     dirty();
00053 }
00054 
00055 void TextWidget::setVAlign(VAlign alignment) {
00056     _valign = alignment;
00057     dirty();
00058 }
00059 
00060 void TextWidget::_draw()
00061 {
00062     Widget::_draw();
00063     
00064     /**
00065     * Figure out how many lines of text we have
00066     **/
00067     int numLines = 1;
00068     char *c = _text;
00069     while(*c != NULL) {
00070         if(*c == '\n') {
00071             numLines++;
00072         }
00073         c++;
00074     }
00075     
00076     /******************************************************************/
00077     /*   ---------------------------------            ^               */
00078     /*   |                               |            |               */
00079     /*   |                               |            |               */
00080     /*   |                               |       inner.height         */
00081     /*   |                               |            |               */
00082     /*   |                               |            |               */
00083     /*   |                               |            |               */
00084     /*   |                               |            |               */
00085     /*   ---------------------------------            |               */
00086     /******************************************************************/
00087     /**
00088     * We need a window as high as the font with it's origin:
00089     * VALIGN=TOP    : (0, 0)
00090     * VALIGN=MIDDLE : (0, inner.height/2 - numLines * font.height/2)
00091     * VALIGN=BOTTOM : (0, inner.height   - numLines * font.height)
00092     **/
00093     int offset=0;
00094     switch(_valign) {
00095         case TOP:    offset = 0; break;
00096         case MIDDLE: offset = (_inner.height - (numLines * _font->zoomedHeight()))/2; break;
00097         case BOTTOM: offset = (_inner.height - (numLines * _font->zoomedHeight())); break;
00098     }
00099 
00100     _renderer->setForeground(_fg);
00101     _renderer->setBackground(_bg);
00102     
00103     // Renderer window is only high enough for the number of lines to draw. 
00104     int h = _font->zoomedHeight() * numLines;
00105     // Clip to fit within the TextWidget inner
00106     if((h + offset) > _inner.height) {
00107         h = _inner.height - offset;
00108     }
00109     
00110     _renderer->window(_inner.x, _inner.y + offset, _inner.width, h, false);
00111     _renderer->puts(_text, display(), _font);
00112     display()->copy_to_lcd();
00113 }