imtk

annotate src/layout.c @ 27:48e708baa7be

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added predicate imtk_layout_contains(x, y)
author John Tsiombikas <nuclear@member.fsf.org>
date Sat, 12 Dec 2020 17:20:00 +0200
parents f416d8def7ef
children
rev   line source
nuclear@23 1 #include <string.h>
nuclear@24 2 #include <assert.h>
nuclear@23 3 #include "imtk.h"
nuclear@23 4
nuclear@23 5 struct layout {
nuclear@23 6 int box[4], span[4];
nuclear@23 7 int spacing;
nuclear@23 8 int dir;
nuclear@23 9 };
nuclear@23 10
nuclear@23 11 #define MAX_STACK_DEPTH 4
nuclear@23 12 static struct layout st[MAX_STACK_DEPTH];
nuclear@23 13 static int top = 0;
nuclear@23 14
nuclear@23 15 int imtk_layout_push(void)
nuclear@23 16 {
nuclear@23 17 int newtop = top + 1;
nuclear@23 18
nuclear@23 19 assert(newtop < MAX_STACK_DEPTH);
nuclear@23 20 if(newtop >= MAX_STACK_DEPTH) {
nuclear@23 21 return -1;
nuclear@23 22 }
nuclear@23 23
nuclear@23 24 st[newtop] = st[top++];
nuclear@23 25 return 0;
nuclear@23 26 }
nuclear@23 27
nuclear@23 28 int imtk_layout_pop(void)
nuclear@23 29 {
nuclear@23 30 assert(top > 0);
nuclear@23 31 if(top <= 0) {
nuclear@23 32 return -1;
nuclear@23 33 }
nuclear@23 34 top--;
nuclear@24 35 return 0;
nuclear@23 36 }
nuclear@23 37
nuclear@24 38 void imtk_layout_start(int x, int y)
nuclear@23 39 {
nuclear@23 40 st[top].box[0] = st[top].span[0] = x;
nuclear@23 41 st[top].box[1] = st[top].span[1] = y;
nuclear@23 42 st[top].box[2] = st[top].box[3] = st[top].span[2] = st[top].span[3] = 0;
nuclear@24 43 /* st[top].spacing = sp;
nuclear@24 44 st[top].dir = dir;*/
nuclear@23 45 }
nuclear@23 46
nuclear@23 47 void imtk_layout_dir(int dir)
nuclear@23 48 {
nuclear@23 49 st[top].dir = dir;
nuclear@23 50 if(dir == IMTK_VERTICAL) {
nuclear@23 51 imtk_layout_newline();
nuclear@23 52 }
nuclear@23 53 }
nuclear@23 54
nuclear@24 55 void imtk_layout_spacing(int spacing)
nuclear@24 56 {
nuclear@24 57 st[top].spacing = spacing;
nuclear@24 58 }
nuclear@24 59
nuclear@23 60 void imtk_layout_advance(int width, int height)
nuclear@23 61 {
nuclear@23 62 int max_span_y, max_box_y;
nuclear@23 63
nuclear@23 64 st[top].span[2] += width + st[top].spacing;
nuclear@23 65
nuclear@23 66 if(height > st[top].span[3]) {
nuclear@23 67 st[top].span[3] = height;
nuclear@23 68 }
nuclear@23 69
nuclear@23 70 max_span_y = st[top].span[1] + st[top].span[3];
nuclear@23 71 max_box_y = st[top].box[1] + st[top].box[3];
nuclear@23 72
nuclear@23 73 if(max_span_y > max_box_y) {
nuclear@23 74 st[top].box[3] = max_span_y - st[top].box[1];
nuclear@23 75 }
nuclear@23 76 if(st[top].span[2] > st[top].box[2]) {
nuclear@23 77 st[top].box[2] = st[top].span[2];
nuclear@23 78 }
nuclear@23 79
nuclear@23 80 if(st[top].dir == IMTK_VERTICAL) {
nuclear@23 81 imtk_layout_newline();
nuclear@23 82 }
nuclear@23 83 }
nuclear@23 84
nuclear@23 85 void imtk_layout_newline(void)
nuclear@23 86 {
nuclear@23 87 st[top].span[0] = st[top].box[0];
nuclear@24 88 st[top].span[1] = st[top].box[1] + st[top].box[3] + st[top].spacing;
nuclear@23 89 st[top].span[2] = st[top].span[3] = 0;
nuclear@23 90 }
nuclear@23 91
nuclear@23 92 void imtk_layout_get_pos(int *x, int *y)
nuclear@23 93 {
nuclear@23 94 *x = st[top].span[0] + st[top].span[2];
nuclear@23 95 *y = st[top].span[1];
nuclear@23 96 }
nuclear@23 97
nuclear@23 98 void imtk_layout_get_bounds(int *bbox)
nuclear@23 99 {
nuclear@23 100 memcpy(bbox, st[top].box, sizeof st[top].box);
nuclear@23 101 }
nuclear@27 102
nuclear@27 103 int imtk_layout_contains(int x, int y)
nuclear@27 104 {
nuclear@27 105 if(x < st[top].box[0] || x >= st[top].box[0] + st[top].box[2]) {
nuclear@27 106 return 0;
nuclear@27 107 }
nuclear@27 108 if(y < st[top].box[1] || y >= st[top].box[1] + st[top].box[3]) {
nuclear@27 109 return 0;
nuclear@27 110 }
nuclear@27 111 return 1;
nuclear@27 112 }