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annotate libmlk-ui/mlk/ui/button.c @ 450:b26dd49f69ff

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core: event -> mlk_event (and friends)
author David Demelier <markand@malikania.fr>
date Sat, 18 Feb 2023 13:37:11 +0100
parents 773a082f0b91
children c4f31658104d
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1 /*
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2 * button.c -- GUI button
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3 *
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4 * Copyright (c) 2020-2023 David Demelier <markand@malikania.fr>
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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19 #include <assert.h>
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20 #include <string.h>
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21
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22 #include <mlk/core/event.h>
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23 #include <mlk/core/maths.h>
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24 #include <mlk/core/painter.h>
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25 #include <mlk/core/trace.h>
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26
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27 #include "align.h"
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28 #include "button.h"
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29 #include "label.h"
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30 #include "theme.h"
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31
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32 static int
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33 is_boxed(const struct button *button, const struct mlk_event_click *click)
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34 {
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35 assert(button);
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36 assert(click);
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37 assert(click->type == MLK_EVENT_CLICKDOWN || click->type == MLK_EVENT_CLICKUP);
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38
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39 return maths_is_boxed(button->x, button->y, button->w, button->h,
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40 click->x, click->y);
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41 }
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42
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43 void
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44 button_draw_default(const struct theme *t, const struct button *button)
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45 {
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46 assert(t);
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47 assert(button);
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48
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49 (void)t;
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50
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51 struct label label = {
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52 .text = button->text,
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53 };
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54 unsigned int lw, lh;
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55
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56 label_query(&label, &lw, &lh);
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57
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58 if (lw > button->w)
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59 tracef("button width is too small for text: %u < %u", button->w, lw);
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60 if (lh > button->h)
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61 tracef("button height is too small for text: %u < %u", button->h, lh);
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62
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63 align(ALIGN_CENTER, &label.x, &label.y, lw, lh,
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64 button->x, button->y, button->w, button->h);
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65
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66 painter_set_color(0x577277ff);
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67 painter_draw_rectangle(button->x, button->y, button->w, button->h);
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68
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69 label_draw(&label);
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70 }
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72 int
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73 button_handle(struct button *button, const union mlk_event *ev)
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74 {
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75 assert(button);
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76 assert(ev);
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78 switch (ev->type) {
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79 case MLK_EVENT_CLICKDOWN:
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80 if (is_boxed(button, &ev->click))
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81 button->state = BUTTON_STATE_PRESSED;
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82 break;
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83 case MLK_EVENT_CLICKUP:
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84 /*
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85 * If the button was pressed, indicate that the button is
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86 * finally activated. This let the user to move the cursor
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87 * outside the button to "forget" the press.
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88 */
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89 if (!is_boxed(button, &ev->click))
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90 button->state = BUTTON_STATE_NONE;
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91 else if (button->state == BUTTON_STATE_PRESSED)
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92 button->state = BUTTON_STATE_ACTIVATED;
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93 break;
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94 default:
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95 break;
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96 }
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98 return button->state == BUTTON_STATE_ACTIVATED;
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99 }
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101 void
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102 button_reset(struct button *button)
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103 {
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104 assert(button);
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105
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106 button->state = BUTTON_STATE_NONE;
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107 }
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108
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109 void
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110 button_draw(const struct button *button)
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111 {
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112 assert(button);
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113
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114 theme_draw_button(button->theme, button);
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115 }