Duncan McIntyre / SimpleGUI

Foundation classes for a basic GUI implementing simple widgets and events

Dependents:   TouchScreenGUIDemo

Widgets/TextWidget.cpp@1:48796b602c86, 2016-03-25 (annotated)

Committer:
duncanFrance
Date:
Fri Mar 25 16:47:33 2016 +0000
Revision:
1:48796b602c86
Parent:
0:0a590815d51c
Child:
2:bb9183379488
Implement default isEventTarget on Widget

Who changed what in which revision?

UserRevisionLine numberNew contents of line
duncanFrance 0:0a590815d51c 1 #include "TextWidget.h"
duncanFrance 0:0a590815d51c 2
duncanFrance 0:0a590815d51c 3 /**
duncanFrance 0:0a590815d51c 4 * A basic widget implementation which just draws some text.
duncanFrance 0:0a590815d51c 5 * If the text does not fit in the bounding-box it will be clipped
duncanFrance 0:0a590815d51c 6 **/
duncanFrance 0:0a590815d51c 7
duncanFrance 0:0a590815d51c 8 TextWidget::TextWidget(GraphicsDisplay* display) : Widget(display) {}
duncanFrance 0:0a590815d51c 9
duncanFrance 1:48796b602c86 10 void TextWidget::setText(char* text)
duncanFrance 1:48796b602c86 11 {
duncanFrance 0:0a590815d51c 12 _text = text;
duncanFrance 0:0a590815d51c 13 }
duncanFrance 0:0a590815d51c 14
duncanFrance 1:48796b602c86 15 void TextWidget::setFont(unsigned char* f, unsigned char firstascii, unsigned char lastascii, bool proportional)
duncanFrance 1:48796b602c86 16 {
duncanFrance 1:48796b602c86 17 _font = f;
duncanFrance 1:48796b602c86 18 // read font parameter from start of array in format understood by UniGraphics for now
duncanFrance 1:48796b602c86 19 //fontoffset = font[0]; // bytes / char
duncanFrance 1:48796b602c86 20 _fontWidth = _font[1];
duncanFrance 1:48796b602c86 21 _fontHeight = _font[2];
duncanFrance 1:48796b602c86 22 //fontbpl = font[3]; // bytes per line
duncanFrance 1:48796b602c86 23 _fontBytesPerLine = (_fontHeight+7) >> 3; //bytes per line, rounded up to multiple of 8
duncanFrance 1:48796b602c86 24 _fontOffset = (_fontWidth * _fontBytesPerLine) + 1;
duncanFrance 1:48796b602c86 25 _fontFirstAscii = firstascii; // first ascii code present in font array (usually 32)
duncanFrance 1:48796b602c86 26 _fontLastAscii = lastascii; // last ascii code present in font array (usually 127)
duncanFrance 1:48796b602c86 27 _fontProportional = proportional;
duncanFrance 0:0a590815d51c 28 }
duncanFrance 0:0a590815d51c 29
duncanFrance 1:48796b602c86 30 void TextWidget::draw()
duncanFrance 1:48796b602c86 31 {
duncanFrance 0:0a590815d51c 32
duncanFrance 0:0a590815d51c 33 int right = _x + _width; // right side of clipping window
duncanFrance 1:48796b602c86 34 int bottom = _y + _height; // bottom edge of clipping window
duncanFrance 0:0a590815d51c 35
duncanFrance 0:0a590815d51c 36 int _cx = _x;
duncanFrance 0:0a590815d51c 37 // Start drawing characters at top left
duncanFrance 1:48796b602c86 38 int _cy = _y;
duncanFrance 0:0a590815d51c 39
duncanFrance 0:0a590815d51c 40 char c;
duncanFrance 0:0a590815d51c 41 char *p = _text;
duncanFrance 1:48796b602c86 42 unsigned char* glyph;
duncanFrance 1:48796b602c86 43 uint8_t charWidth;
duncanFrance 1:48796b602c86 44
duncanFrance 0:0a590815d51c 45 _display->foreground(_fg);
duncanFrance 0:0a590815d51c 46 _display->background(_bg);
duncanFrance 1:48796b602c86 47 _display->set_font(_font);
duncanFrance 1:48796b602c86 48
duncanFrance 1:48796b602c86 49
duncanFrance 1:48796b602c86 50 while(*p != NULL) {
duncanFrance 0:0a590815d51c 51 c = *p;
duncanFrance 0:0a590815d51c 52 p++;
duncanFrance 0:0a590815d51c 53 if(c=='\n') {
duncanFrance 1:48796b602c86 54 _cy = _cy + _fontHeight;
duncanFrance 0:0a590815d51c 55 _cx = _x;
duncanFrance 0:0a590815d51c 56 } else {
duncanFrance 0:0a590815d51c 57 // Only draw the character if it is not clipped
duncanFrance 1:48796b602c86 58 if( (_cx+_fontWidth) < right && (_cy +_fontHeight) < bottom) {
duncanFrance 0:0a590815d51c 59 _display->character(_cx, _cy, c);
duncanFrance 1:48796b602c86 60 glyph = &_font[((c - _fontFirstAscii) * _fontOffset) + 4]; // start of char bitmap
duncanFrance 1:48796b602c86 61 charWidth = glyph[0]; // width of actual char
duncanFrance 1:48796b602c86 62
duncanFrance 1:48796b602c86 63 if(_fontProportional) {
duncanFrance 1:48796b602c86 64 if((charWidth+1) < _fontWidth) {
duncanFrance 1:48796b602c86 65 _cx += charWidth + 1; // put at least 1 blank after variable-width characters, except characters that occupy whole fonthor space like "_"
duncanFrance 1:48796b602c86 66 } else {
duncanFrance 1:48796b602c86 67 _cx += _fontWidth;
duncanFrance 1:48796b602c86 68 }
duncanFrance 1:48796b602c86 69 } else {
duncanFrance 1:48796b602c86 70 _cx += _fontWidth; // fixed width
duncanFrance 1:48796b602c86 71 }
duncanFrance 0:0a590815d51c 72 }
duncanFrance 0:0a590815d51c 73 }
duncanFrance 0:0a590815d51c 74 }
duncanFrance 0:0a590815d51c 75 }
duncanFrance 0:0a590815d51c 76
duncanFrance 1:48796b602c86 77 bool TextWidget::isEventTarget(Event e)
duncanFrance 1:48796b602c86 78 {
duncanFrance 0:0a590815d51c 79 return e.screenX < (_x+_width) && _x <= e.screenX && e.screenY < (_y+_height) && _y <= e.screenY;
duncanFrance 0:0a590815d51c 80 }