145 lines
6.4 KiB
C
145 lines
6.4 KiB
C
/**************************************************************************************************************************************
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* Project: discoverpixy
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* Website: https://github.com/t-moe/discoverpixy
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* Authors: Aaron Schmocker, Timo Lang
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* Institution: BFH Bern University of Applied Sciences
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* File: common/gui/checkbox.c
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*
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* Version History:
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* Date Autor Email SHA Changes
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* 2015-04-27 timolang@gmail.com b300ac5 Added Checkbox support
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* 2015-05-17 timolang@gmail.com 2d46336 Improved comments in implementation of button, checkbox, numupdown, tft, touch and screen modules/submodules.
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*
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**************************************************************************************************************************************/
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#include "tft.h"
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#include "touch.h"
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#include "checkbox.h"
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#include <stdio.h>
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/* The idea is as follows:
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* When the user creates a checkbox we create a touch area for that region and wait for PEN_DOWN events.
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* Once the user puts the pen down in this area we'll redraw the checkbox with different shadows (feedback)
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* and we'll now wait on PEN_UP or PEN_LEAVE events.
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* If the user takes the pen away while in the area (PEN_UP), we toggle the checkbox and we call the provided user callback
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* Otherwise (PEN_LEAVE) we only restore the initial shadows
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*/
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#define ACTIVE_COLOR RGB(251,208,123) //shadow color (inside of border)
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#define BORDER_COLOR RGB(29,82,129) //1px border color
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#define BACKGROUND_COLOR WHITE //Background color
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//Callback which is called when the user touches the touch-area we created for the checkbox
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void checkboxes_cb(void* touchArea, TOUCH_ACTION triggeredAction)
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{
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TOUCH_AREA_STRUCT* area = (TOUCH_AREA_STRUCT*)touchArea;
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CHECKBOX_STRUCT* checkbox = (CHECKBOX_STRUCT*)touchArea;
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switch (triggeredAction) {
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case PEN_DOWN: //If the user touches the area for the "first time"
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area->hookedActions = PEN_UP | PEN_LEAVE; //for the future we only want PEN_UP and PEN_LEAVE events
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//Draw active shadows
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tft_draw_rectangle(checkbox->base.x1 + 1, checkbox->base.y1 + 1, checkbox->base.x2 - 1, checkbox->base.y2 - 1, ACTIVE_COLOR);
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tft_draw_rectangle(checkbox->base.x1 + 2, checkbox->base.y1 + 2, checkbox->base.x2 - 2, checkbox->base.y2 - 2, ACTIVE_COLOR);
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break;
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case PEN_UP: //If the user took the pen away, while in the area (=toggle checkbox!)
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checkbox->checked = !checkbox->checked; //Toggle checkbox state
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gui_checkbox_update(checkbox); //redraw/overdraw tickmark
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if (checkbox->callback != NULL) { //The user provided a callback
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checkbox->callback(checkbox, checkbox->checked); //Call the provided callback with the new checked state
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}
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// no break statement here!
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case PEN_LEAVE: //if the user "slided out" of the area
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area->hookedActions = PEN_DOWN; //for the future we only want PEN_DOWN events
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//Draw inactive shadows
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tft_draw_rectangle(checkbox->base.x1 + 1, checkbox->base.y1 + 1, checkbox->base.x2 - 1, checkbox->base.y2 - 1, BACKGROUND_COLOR);
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tft_draw_rectangle(checkbox->base.x1 + 2, checkbox->base.y1 + 2, checkbox->base.x2 - 2, checkbox->base.y2 - 2, BACKGROUND_COLOR);
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break;
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default:
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break;
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}
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}
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bool gui_checkbox_add(CHECKBOX_STRUCT* checkbox)
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{
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if (touch_have_empty(1)) { //Check if the touch module can handle one additional area
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unsigned char size = 0;
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checkbox->base.hookedActions = PEN_DOWN; //At first we are interested in PEN_DOWN events
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checkbox->base.callback = checkboxes_cb; //Use our own callback for the touch area events
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//Check the size of the checkbox
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if (checkbox->base.x2 > checkbox->base.x1) {
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size = checkbox->base.x2 - checkbox->base.x1; //use width a as size
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}
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if (checkbox->base.y2 > checkbox->base.y1) {
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if ((checkbox->base.y2 - checkbox->base.y1) > size) { //height is larger than size
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size = checkbox->base.y2 - checkbox->base.y1; //use height as size
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}
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}
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if (size == 0) { //no size found (maybe swap x2 and x1 or y2 and y1 ?)
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return false; //signal error
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}
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if ((size & 0x01)) { //the size is an odd number
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size++; //make size an even number
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}
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//Correct x2,y2 so that the checkbox is quadratic
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checkbox->base.x2 = checkbox->base.x1 + size;
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checkbox->base.y2 = checkbox->base.y1 + size;
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gui_checkbox_redraw(checkbox);//Call redraw method, which will take care of the drawing of the entire checkbox
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return touch_register_area(&checkbox->base); //Register the touch area and receive events for this checkbox, from now on
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}
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return false; //no more touch areas left
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}
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void gui_checkbox_redraw(CHECKBOX_STRUCT* checkbox)
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{
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//Draw background and border
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tft_fill_rectangle(checkbox->base.x1 + 1, checkbox->base.y1 + 1, checkbox->base.x2 - 1, checkbox->base.y2 - 1, BACKGROUND_COLOR);
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tft_draw_rectangle(checkbox->base.x1, checkbox->base.y1, checkbox->base.x2, checkbox->base.y2, BORDER_COLOR);
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if (checkbox->checked) { //checkbox is currently checked
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gui_checkbox_update(checkbox); //Call update method which will draw the tickmark
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}
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}
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void gui_checkbox_remove(CHECKBOX_STRUCT* checkbox)
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{
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//We only need to unregister the touch area, as we have not allocated anything else
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touch_unregister_area((TOUCH_AREA_STRUCT*)checkbox);
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}
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void gui_checkbox_update(CHECKBOX_STRUCT* checkbox)
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{
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unsigned int c = (checkbox->checked) ? checkbox->fgcolor : BACKGROUND_COLOR; //color to use for the tickmark
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//helper points inside the checkbox
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unsigned int xcent = checkbox->base.x1 + (checkbox->base.x2 - checkbox->base.x1) * 6 / 14;
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unsigned int yleft = checkbox->base.y2 - (xcent - checkbox->base.x1) - 1 ;
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unsigned int yright = checkbox->base.y2 - (checkbox->base.x2 - xcent) - 1 ;
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unsigned int ybot = checkbox->base.y2 - 4;
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//Draw tickmark as a 3pixel wide line
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tft_draw_line(checkbox->base.x1 + 3, yleft - 1, xcent, ybot - 1, c);
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tft_draw_line(checkbox->base.x1 + 3, yleft, xcent, ybot , c);
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tft_draw_line(checkbox->base.x1 + 3, yleft + 1, xcent, ybot + 1, c);
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xcent++;
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ybot--;
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tft_draw_line(xcent, ybot - 1, checkbox->base.x2 - 3, yright - 1, c);
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tft_draw_line(xcent, ybot, checkbox->base.x2 - 3, yright + 0, c);
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tft_draw_line(xcent, ybot + 1, checkbox->base.x2 - 3, yright + 1, c);
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}
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