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1/* Copyright 2021 Jaakko Keränen <jaakko.keranen@iki.fi>
2
3Redistribution and use in source and binary forms, with or without
4modification, are permitted provided that the following conditions are met:
5
61. Redistributions of source code must retain the above copyright notice, this
7 list of conditions and the following disclaimer.
82. Redistributions in binary form must reproduce the above copyright notice,
9 this list of conditions and the following disclaimer in the documentation
10 and/or other materials provided with the distribution.
11
12THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
13ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
14WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
15DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
16ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
17(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
18LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
19ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
20(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
21SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
22
23#include "touch.h"
24#include "window.h"
25#include "app.h"
26
27#include <the_Foundation/array.h>
28#include <the_Foundation/math.h>
29#include <SDL_timer.h>
30
31iDeclareType(Touch)
32iDeclareType(TouchState)
33iDeclareType(Momentum)
34
35struct Impl_Touch {
36 SDL_FingerID id;
37 iWidget *affinity; /* widget on which the touch started */
38 iBool hasMoved;
39 uint32_t startTime;
40 iFloat3 startPos;
41 uint32_t posTime[2];
42 iFloat3 pos[2];
43 iFloat3 remainder;
44};
45
46iLocalDef void pushPos_Touch_(iTouch *d, const iFloat3 pos, uint32_t time) {
47 d->posTime[1] = d->posTime[0];
48 d->posTime[0] = time;
49 d->pos[1] = d->pos[0];
50 d->pos[0] = pos;
51}
52
53struct Impl_Momentum {
54 iWidget *affinity;
55 uint32_t releaseTime;
56 iFloat3 velocity;
57 iFloat3 accum;
58};
59
60struct Impl_TouchState {
61 iArray *touches;
62 iArray *moms;
63 double lastMomTime;
64};
65
66static iTouchState *touchState_(void) {
67 static iTouchState state_;
68 iTouchState *d = &state_;
69 if (!d->touches) {
70 d->touches = new_Array(sizeof(iTouch));
71 d->moms = new_Array(sizeof(iMomentum));
72 d->lastMomTime = SDL_GetTicks();
73 }
74 return d;
75}
76
77static iTouch *find_TouchState_(iTouchState *d, SDL_FingerID id) {
78 iConstForEach(Array, i, d->touches) {
79 iTouch *touch = (iTouch *) i.value;
80 if (touch->id == id) {
81 return touch;
82 }
83 }
84 return NULL;
85}
86
87static uint32_t longPressSpanMs_ = 500;
88static int tapRadiusPt_ = 15;
89
90static iBool isStationary_Touch_(const iTouch *d) {
91 return !d->hasMoved &&
92 length_F3(sub_F3(d->pos[0], d->startPos)) < tapRadiusPt_ * get_Window()->pixelRatio;
93}
94
95static void dispatchClick_Touch_(const iTouch *d, int button) {
96 const iFloat3 tapPos = divf_F3(add_F3(d->pos[0], d->startPos), 2);
97 SDL_MouseButtonEvent btn = {
98 .type = SDL_MOUSEBUTTONDOWN,
99 .button = button,
100 .clicks = 1,
101 .state = SDL_PRESSED,
102 .timestamp = SDL_GetTicks(),
103 .which = SDL_TOUCH_MOUSEID,
104 .x = x_F3(tapPos),
105 .y = y_F3(tapPos)
106 };
107 dispatchEvent_Widget(get_Window()->root, (SDL_Event *) &btn);
108 /* Immediately released, too. */
109 btn.type = SDL_MOUSEBUTTONUP;
110 btn.state = SDL_RELEASED;
111 btn.timestamp = SDL_GetTicks();
112 dispatchEvent_Widget(get_Window()->root, (SDL_Event *) &btn);
113}
114
115static void clearWidgetMomentum_TouchState_(iTouchState *d, iWidget *widget) {
116 if (!widget) return;
117 iForEach(Array, m, d->moms) {
118 iMomentum *mom = m.value;
119 if (mom->affinity == widget) {
120 remove_ArrayIterator(&m);
121 }
122 }
123}
124
125static void update_TouchState_(void *ptr) {
126 iTouchState *d = ptr;
127 const uint32_t nowTime = SDL_GetTicks();
128 /* Check for long presses to simulate right clicks. */
129 iForEach(Array, i, d->touches) {
130 iTouch *touch = i.value;
131 /* Holding a touch will reset previous momentum for this widget. */
132 if (isStationary_Touch_(touch)) {
133 if (nowTime - touch->startTime > 25) {
134 clearWidgetMomentum_TouchState_(d, touch->affinity);
135 }
136 if (nowTime - touch->startTime >= longPressSpanMs_ && touch->affinity) {
137 dispatchClick_Touch_(touch, SDL_BUTTON_RIGHT);
138 remove_ArrayIterator(&i);
139 }
140 }
141 }
142 /* Update/cancel momentum scrolling. */ {
143 const float minSpeed = 10.0f;
144 const float momFriction = 0.975f;
145 const float stepDurationMs = 1000.0f / 120.0f;
146 double momAvailMs = nowTime - d->lastMomTime;
147 int numSteps = iMin((int) (momAvailMs / stepDurationMs), 10);
148 d->lastMomTime += numSteps * stepDurationMs;
149// printf("mom steps:%d\n", numSteps);
150 iForEach(Array, m, d->moms) {
151 if (numSteps == 0) break;
152 iMomentum *mom = m.value;
153 for (int step = 0; step < numSteps; step++) {
154 mulvf_F3(&mom->velocity, momFriction);
155 addv_F3(&mom->accum, mulf_F3(mom->velocity, stepDurationMs / 1000.0f));
156 }
157 const iInt2 pixels = initF3_I2(mom->accum);
158 if (pixels.x || pixels.y) {
159 subv_F3(&mom->accum, initI2_F3(pixels));
160 dispatchEvent_Widget(mom->affinity, (SDL_Event *) &(SDL_MouseWheelEvent){
161 .type = SDL_MOUSEWHEEL,
162 .timestamp = SDL_GetTicks(),
163 .which = 0, /* means "precise scrolling" in DocumentWidget */
164 .x = pixels.x,
165 .y = pixels.y
166 });
167 }
168 //printf("mom vel:%f\n", length_F3(mom->velocity));
169 if (length_F3(mom->velocity) < minSpeed) {
170 remove_ArrayIterator(&m);
171 }
172 }
173 }
174 /* Keep updating if interaction is still ongoing. */
175 if (!isEmpty_Array(d->touches) || !isEmpty_Array(d->moms)) {
176 addTicker_App(update_TouchState_, ptr);
177 }
178}
179
180iBool processEvent_Touch(const SDL_Event *ev) {
181 /* We only handle finger events here. */
182 if (ev->type != SDL_FINGERDOWN && ev->type != SDL_FINGERMOTION && ev->type != SDL_FINGERUP) {
183 return iFalse;
184 }
185 iTouchState *d = touchState_();
186 const SDL_TouchFingerEvent *fing = &ev->tfinger;
187 iWindow *window = get_Window();
188 const iInt2 rootSize = rootSize_Window(window);
189 const iFloat3 pos = init_F3(fing->x * rootSize.x, fing->y * rootSize.y, 0);
190 //printf("%2d: %f: touch %f, %f\n", ev->type, z_F3(pos), x_F3(pos), y_F3(pos));
191 //fflush(stdout);
192 const uint32_t nowTime = SDL_GetTicks();
193 if (ev->type == SDL_FINGERDOWN) {
194 /* Register the new touch. */
195 iWidget *aff = hitChild_Widget(window->root, init_I2(iRound(x_F3(pos)), iRound(y_F3(pos))));
196 pushBack_Array(d->touches, &(iTouch){
197 .id = fing->fingerId,
198 .affinity = aff,
199 .startTime = nowTime,
200 .startPos = pos,
201 .pos = pos
202 });
203 /* Some widgets rely on hover state. */
204 dispatchEvent_Widget(window->root, (SDL_Event *) &(SDL_MouseMotionEvent){
205 .type = SDL_MOUSEMOTION,
206 .timestamp = SDL_GetTicks(),
207 .which = SDL_TOUCH_MOUSEID,
208 .x = x_F3(pos),
209 .y = y_F3(pos)
210 });
211 addTicker_App(update_TouchState_, d);
212 }
213 else if (ev->type == SDL_FINGERMOTION) {
214 iTouch *touch = find_TouchState_(d, fing->fingerId);
215 if (touch && touch->affinity) {
216 /* TODO: Update touch position. */
217 const iFloat3 amount = add_F3(touch->remainder,
218 divf_F3(mul_F3(init_F3(fing->dx, fing->dy, 0),
219 init_F3(rootSize.x, rootSize.y, 0)),
220 window->pixelRatio));
221 const iInt2 pixels = init_I2(iRound(x_F3(amount)), iRound(y_F3(amount)));
222 iFloat3 remainder = sub_F3(amount, initI2_F3(pixels));
223 touch->remainder = remainder;
224 pushPos_Touch_(touch, pos, nowTime);
225 if (!touch->hasMoved && !isStationary_Touch_(touch)) {
226 touch->hasMoved = iTrue;
227 }
228 if (pixels.x || pixels.y) {
229// printf("%p (%s) wy: %f\n", touch->affinity, class_Widget(touch->affinity)->name,
230// fing->dy * rootSize.y / window->pixelRatio);
231 dispatchEvent_Widget(touch->affinity, (SDL_Event *) &(SDL_MouseWheelEvent){
232 .type = SDL_MOUSEWHEEL,
233 .timestamp = SDL_GetTicks(),
234 .which = 0, /* means "precise scrolling" in DocumentWidget */
235 .x = pixels.x,
236 .y = pixels.y
237 });
238 /* TODO: Keep increasing movement if the direction is the same. */
239 clearWidgetMomentum_TouchState_(d, touch->affinity);
240 }
241 }
242 }
243 else if (ev->type == SDL_FINGERUP) {
244 iTouch *touch = find_TouchState_(d, fing->fingerId);
245 iForEach(Array, i, d->touches) {
246 iTouch *touch = i.value;
247 if (touch->id != fing->fingerId) {
248 continue;
249 }
250 const uint32_t elapsed = nowTime - touch->posTime[1];
251 iFloat3 velocity = zero_F3();
252 if (elapsed < 50) {
253 velocity = divf_F3(sub_F3(pos, touch->pos[1]), (float) elapsed / 1000.0f);
254 }
255 pushPos_Touch_(touch, pos, nowTime);
256 iBool wasUsed = iFalse;
257 const uint32_t duration = nowTime - touch->startTime;
258 /* If short and didn't move far, do a tap (left click). */
259 if (duration < longPressSpanMs_ && isStationary_Touch_(touch)) {
260 dispatchClick_Touch_(touch, SDL_BUTTON_LEFT);
261 }
262 else if (length_F3(velocity) > 10.0f) {
263 clearWidgetMomentum_TouchState_(d, touch->affinity);
264 iMomentum mom = {
265 .affinity = touch->affinity,
266 .releaseTime = nowTime,
267 .velocity = velocity
268 };
269 if (isEmpty_Array(d->moms)) {
270 d->lastMomTime = nowTime;
271 }
272 pushBack_Array(d->moms, &mom);
273 }
274 remove_ArrayIterator(&i);
275 }
276 }
277 return iTrue;
278}
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