Merge branch 'master' of https://git.hippoz.xyz/hippoz/uui
This commit is contained in:
hippoz
commit
090539e33b
GPG key ID:
7C52899193467641
4 changed files with 401 additions and 0 deletions
2
.gitignore
vendored
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2
.gitignore
vendored
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ui
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9
LICENSE
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9
LICENSE
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MIT License
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Copyright (c) 2021 hippoz
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Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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6
Makefile
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6
Makefile
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CFLAGS=-Wall -Wextra -std=c11 -pedantic `pkg-config --cflags cairo pangocairo`
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LIBS=`pkg-config --libs cairo pangocairo` -lX11
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ui: main.c
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$(CC) $(CFLAGS) -o ui main.c $(LIBS)
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384
main.c
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384
main.c
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#include <X11/Xlib.h>
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#include <X11/Xatom.h>
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#include <X11/Xutil.h>
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#include <cairo.h>
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#include <cairo-xlib.h>
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#include <pango/pangocairo.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#define M_PI 3.14159265358979323846
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typedef struct Vec2 {
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double x, y;
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} Vec2;
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typedef struct RGB {
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double r, g, b;
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} RGB;
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typedef struct uui_row {
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Vec2 starting_position, position, spacing, element_size;
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bool is_vertical;
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} uui_row_t;
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typedef struct uui_context {
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int hot_id, active_id;
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Vec2 mouse_pos;
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bool mouse1_down;
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cairo_t *cr;
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} uui_context_t;
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typedef enum {
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TEXT_CENTER_ALIGN,
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TEXT_CENTER_ALIGN_LEFT,
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} TextCenterAlign;
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typedef struct uui_text_style {
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RGB text_color;
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PangoFontDescription *font_description;
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TextCenterAlign center_align;
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} uui_text_style_t;
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typedef struct uui_button_style {
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RGB normal_color, hot_color, active_color;
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double border_radius;
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int do_fill;
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uui_text_style_t *text_style;
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} uui_button_style_t;
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Vec2 vec2(double x, double y) {
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return (Vec2) {
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x, y
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};
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}
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RGB rgb(double r, double g, double b) {
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return (RGB) {
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r, g, b
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};
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}
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bool uui_collide_point_rect(Vec2 pos, Vec2 size, Vec2 point) {
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return point.x >= pos.x && pos.x + size.x >= point.x &&
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point.y >= pos.y && pos.y + size.y >= point.y;
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}
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void panic(int exit_code, const char *error) {
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fputs(error, stderr);
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exit(exit_code);
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}
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cairo_surface_t *create_x11_surface(int x, int y) {
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Display *dsp;
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Drawable da;
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int screen;
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cairo_surface_t *sfc;
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if ((dsp = XOpenDisplay(NULL)) == NULL)
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panic(1, "Failed to open display");
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screen = DefaultScreen(dsp);
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da = XCreateSimpleWindow(dsp, DefaultRootWindow(dsp), 0, 0, x, y, 0, 0, 0);
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XSelectInput(dsp, da, ButtonPressMask | ButtonReleaseMask | KeyPressMask | PointerMotionMask);
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XMapWindow(dsp, da);
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sfc = cairo_xlib_surface_create(dsp, da, DefaultVisual(dsp, screen), x, y);
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cairo_xlib_surface_set_size(sfc, x, y);
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return sfc;
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}
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void destroy_x11_surface(cairo_surface_t *sfc) {
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Display *dsp = cairo_xlib_surface_get_display(sfc);
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cairo_surface_destroy(sfc);
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XCloseDisplay(dsp);
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}
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void uui_handle_event(uui_context_t *uc, XEvent *e) {
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char keybuf[8];
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KeySym key;
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switch (e->type) {
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case ButtonPress:
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if (e->xbutton.button == Button1)
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uc->mouse1_down = true;
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break;
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case ButtonRelease:
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if (e->xbutton.button == Button1)
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uc->mouse1_down = false;
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break;
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case KeyPress:
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XLookupString(&e->xkey, keybuf, sizeof(keybuf), &key, NULL);
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break;
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case MotionNotify:
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uc->mouse_pos.x = e->xmotion.x;
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uc->mouse_pos.y = e->xmotion.y;
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break;
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}
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}
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void uui_draw_rect(cairo_t *cr, Vec2 pos, Vec2 size, double border_radius)
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{
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double x = pos.x;
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double y = pos.y;
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double width = size.x;
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double height = size.y;
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if (border_radius > 0) {
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double aspect = 1.0;
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double corner_radius = border_radius;
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double radius = corner_radius / aspect;
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double degrees = M_PI / 180.0;
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cairo_new_sub_path(cr);
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cairo_arc(cr, x + width - radius, y + radius, radius, -90 * degrees, 0 * degrees);
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cairo_arc(cr, x + width - radius, y + height - radius, radius, 0 * degrees, 90 * degrees);
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cairo_arc(cr, x + radius, y + height - radius, radius, 90 * degrees, 180 * degrees);
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cairo_arc(cr, x + radius, y + radius, radius, 180 * degrees, 270 * degrees);
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cairo_close_path(cr);
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} else {
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cairo_rectangle(cr, x, y, width, height);
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}
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}
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void uui_draw_text(cairo_t *cr, PangoFontDescription *desc, Vec2 pos, const char *text) {
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PangoLayout *layout = pango_cairo_create_layout(cr);
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pango_layout_set_font_description(layout, desc);
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pango_layout_set_text(layout, text, -1);
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cairo_move_to(cr, pos.x, pos.y);
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pango_cairo_show_layout(cr, layout);
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g_object_unref(layout);
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}
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void uui_draw_centered_text(cairo_t *cr, PangoFontDescription *desc, TextCenterAlign align, Vec2 rect_pos, Vec2 rect_size, const char *text) {
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PangoLayout *layout = pango_cairo_create_layout(cr);
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int font_width;
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int font_height;
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pango_layout_set_font_description(layout, desc);
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pango_layout_set_text(layout, text, -1);
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pango_layout_get_pixel_size(layout, &font_width, &font_height);
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double x = rect_pos.x + ((rect_size.x - font_width) / 2);
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double y = rect_pos.y + ((rect_size.y - font_height) / 2);
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if (align == TEXT_CENTER_ALIGN_LEFT) {
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// center the text only horizontally and add a hardcoded padding to the x position
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// TODO: unhardcode the padding
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x = rect_pos.x + 4;
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}
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cairo_move_to(cr, x, y);
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pango_cairo_show_layout(cr, layout);
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g_object_unref(layout);
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}
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bool uui_do_click_region(uui_context_t *uc, Vec2 pos, Vec2 size, int id) {
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if (id != -1) {
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/* if the element is hot (hovered) and mouse button 1 is down, it's clicked */
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if (uc->hot_id == id && uc->mouse1_down) {
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/* this function only ever returns true once - when the click happens (unless id == -1, in which case it's checked each time, see below) */
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if (uc->active_id == id) {
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return false;
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}
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uc->active_id = id;
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return true;
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} else {
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uc->active_id = -1;
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return false;
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}
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} else {
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/* if the user provided -1 as an id, we will do the check independently of the hot/active system */
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return uc->mouse1_down && uui_collide_point_rect(pos, size, uc->mouse_pos);
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}
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}
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bool uui_do_hover_region(uui_context_t *uc, Vec2 pos, Vec2 size, int id) {
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if (id != -1) {
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if (uui_collide_point_rect(pos, size, uc->mouse_pos)) {
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uc->hot_id = id;
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return true;
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} else {
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uc->hot_id = -1;
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return false;
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}
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} else {
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/* if the user provided -1 as an id, we will do the check independently of the hot/active system */
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return uui_collide_point_rect(pos, size, uc->mouse_pos);
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}
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}
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void uui_do_text(uui_context_t *uc, uui_text_style_t *style, Vec2 pos, const char *text) {
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cairo_save(uc->cr);
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cairo_set_source_rgb(uc->cr, style->text_color.r, style->text_color.g, style->text_color.b);
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uui_draw_text(uc->cr, style->font_description, pos, text);
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cairo_fill(uc->cr);
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cairo_restore(uc->cr);
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}
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void uui_do_centered_text(uui_context_t *uc, uui_text_style_t *style, Vec2 pos, Vec2 size, const char *text) {
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cairo_save(uc->cr);
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cairo_set_source_rgb(uc->cr, style->text_color.r, style->text_color.g, style->text_color.b);
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uui_draw_centered_text(uc->cr, style->font_description, style->center_align, pos, size, text);
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cairo_fill(uc->cr);
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cairo_restore(uc->cr);
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}
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bool uui_do_button(uui_context_t *uc, uui_button_style_t *style, Vec2 pos, Vec2 size, const char *text, int id) {
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bool clicked = false;
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cairo_save(uc->cr);
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if (uui_do_hover_region(uc, pos, size, id)) {
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cairo_set_source_rgb(uc->cr, style->hot_color.r, style->hot_color.g, style->hot_color.b);
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if (uui_do_click_region(uc, pos, size, id)) {
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cairo_set_source_rgb(uc->cr, style->active_color.r, style->active_color.g, style->active_color.b);
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clicked = true;
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}
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} else {
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cairo_set_source_rgb(uc->cr, style->normal_color.r, style->normal_color.g, style->normal_color.b);
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}
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uui_draw_rect(uc->cr, pos, size, style->border_radius);
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if (style->do_fill) {
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cairo_fill(uc->cr);
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} else {
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cairo_stroke(uc->cr);
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}
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if (text != NULL) {
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uui_do_centered_text(uc, style->text_style, pos, size, text);
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}
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cairo_restore(uc->cr);
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return clicked;
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}
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uui_context_t *uui_context_create(cairo_t *cr) {
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uui_context_t *uc = malloc(sizeof(uui_context_t));
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uc->mouse_pos = vec2(0, 0);
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uc->mouse1_down = false;
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uc->cr = cr;
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return uc;
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}
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void uui_context_destroy(uui_context_t *uc) {
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free(uc);
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}
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void uui_row_start(uui_row_t *row) {
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row->position = row->starting_position;
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}
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void uui_row_advance(uui_row_t *row, Vec2 add) {
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/* advance the position, respecting the spacing, regardless of direction */
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row->position.x += add.x + row->spacing.x;
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row->position.y += add.y + row->spacing.y;
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}
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void uui_row_element(uui_row_t *row) {
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/* increment position based on element size */
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/* the spacing is added regardless of the direction */
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if (row->is_vertical) {
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row->position.y += row->element_size.y;
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} else {
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row->position.x += row->element_size.x;
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}
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row->position.x += row->spacing.x;
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row->position.y += row->spacing.y;
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}
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int main(void) {
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cairo_surface_t *sfc = create_x11_surface(800, 600);
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cairo_t *cr = cairo_create(sfc);
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PangoFontDescription *font_description = pango_font_description_new();
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uui_context_t *uc = uui_context_create(cr);
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uui_button_style_t button_style;
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uui_text_style_t text_style;
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uui_row_t row;
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XEvent e;
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pango_font_description_set_family(font_description, "sans-serif");
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pango_font_description_set_weight(font_description, PANGO_WEIGHT_NORMAL);
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pango_font_description_set_absolute_size(font_description, 16 * PANGO_SCALE);
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button_style.border_radius = 8;
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button_style.do_fill = 1;
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button_style.normal_color = rgb(1.0, 0.0, 0.0);
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button_style.hot_color = rgb(0.0, 1.0, 0.0);
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button_style.active_color = rgb(0.0, 0.0, 1.0);
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button_style.text_style = &text_style;
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text_style.text_color = rgb(1.0, 1.0, 1.0);
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text_style.font_description = font_description;
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text_style.center_align = TEXT_CENTER_ALIGN_LEFT;
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row.starting_position = vec2(20.0, 20.0);
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row.position = vec2(0.0, 0.0);
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row.spacing = vec2(20.0, 0.0);
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row.element_size = vec2(100.0, 30.0);
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row.is_vertical = false;
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int selected_tab = 0;
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for (;;) {
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XNextEvent(cairo_xlib_surface_get_display(sfc), &e);
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uui_handle_event(uc, &e);
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cairo_set_source_rgb(cr, 0.0, 0.0, 0.0);
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cairo_paint(cr);
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uui_row_start(&row);
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if (uui_do_button(uc, &button_style, row.position, row.element_size, "one", 0)) {
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selected_tab = 0;
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}
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uui_row_element(&row);
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if (uui_do_button(uc, &button_style, row.position, row.element_size, "two", 1)) {
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selected_tab = 1;
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}
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uui_row_element(&row);
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if (uui_do_button(uc, &button_style, row.position, row.element_size, "three", 2)) {
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selected_tab = 2;
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}
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uui_row_element(&row);
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if (uui_do_button(uc, &button_style, row.position, row.element_size, "four", 3)) {
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selected_tab = 3;
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}
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uui_row_element(&row);
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char *text = "no tab selected";
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switch (selected_tab) {
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case 0:
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text = "tab 1";
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break;
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case 1:
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text = "tab 2";
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break;
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case 2:
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text = "tab 3";
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break;
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case 3:
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text = "tab 4";
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break;
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}
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uui_do_text(uc, &text_style, row.position, text);
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}
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pango_font_description_free(font_description);
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cairo_destroy(cr);
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destroy_x11_surface(sfc);
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uui_context_destroy(uc);
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return 0;
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}
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