/
DropdownMenuEndIconDelegate.java
306 lines (273 loc) · 10.7 KB
/
DropdownMenuEndIconDelegate.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
/*
* Copyright (C) 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.android.material.textfield;
import com.google.android.material.R;
import static android.view.accessibility.AccessibilityEvent.TYPE_VIEW_CLICKED;
import static androidx.core.view.ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_NO;
import static androidx.core.view.ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_YES;
import static com.google.android.material.textfield.EditTextUtils.isEditable;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ValueAnimator;
import android.annotation.SuppressLint;
import android.content.Context;
import android.os.Build.VERSION;
import android.os.Build.VERSION_CODES;
import android.text.Editable;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnFocusChangeListener;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityManager;
import android.widget.AutoCompleteTextView;
import android.widget.EditText;
import android.widget.Spinner;
import androidx.annotation.ChecksSdkIntAtLeast;
import androidx.annotation.DrawableRes;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.core.view.ViewCompat;
import androidx.core.view.accessibility.AccessibilityNodeInfoCompat;
import com.google.android.material.animation.AnimationUtils;
import com.google.android.material.textfield.TextInputLayout.AccessibilityDelegate;
import com.google.android.material.textfield.TextInputLayout.BoxBackgroundMode;
/** Default initialization of the exposed dropdown menu {@link TextInputLayout.EndIconMode}. */
class DropdownMenuEndIconDelegate extends EndIconDelegate {
@ChecksSdkIntAtLeast(api = VERSION_CODES.LOLLIPOP)
private static final boolean IS_LOLLIPOP = VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP;
private static final int ANIMATION_FADE_OUT_DURATION = 50;
private static final int ANIMATION_FADE_IN_DURATION = 67;
@Nullable
private AutoCompleteTextView autoCompleteTextView;
private final TextInputLayout.AccessibilityDelegate accessibilityDelegate =
new AccessibilityDelegate(textInputLayout) {
@Override
public void onInitializeAccessibilityNodeInfo(
View host, @NonNull AccessibilityNodeInfoCompat info) {
super.onInitializeAccessibilityNodeInfo(host, info);
// The non-editable exposed dropdown menu behaves like a Spinner.
if (!isEditable(autoCompleteTextView)) {
info.setClassName(Spinner.class.getName());
}
if (info.isShowingHintText()) {
// Set hint text to null so TalkBack doesn't announce the label twice when there is no
// item selected.
info.setHintText(null);
}
}
@Override
public void onPopulateAccessibilityEvent(View host, @NonNull AccessibilityEvent event) {
super.onPopulateAccessibilityEvent(host, event);
// If dropdown is non editable, layout click is what triggers showing/hiding the popup
// list. Otherwise, arrow icon alone is what triggers it.
if (event.getEventType() == TYPE_VIEW_CLICKED
&& accessibilityManager.isEnabled()
&& !isEditable(autoCompleteTextView)) {
showHideDropdown();
updateDropdownPopupDirty();
}
}
};
private final OnClickListener onIconClickListener = view -> showHideDropdown();
private final OnFocusChangeListener onEditTextFocusChangeListener = (view, hasFocus) -> {
endLayout.setEndIconActivated(hasFocus);
if (!hasFocus) {
setEndIconChecked(false);
dropdownPopupDirty = false;
}
};
private boolean dropdownPopupDirty = false;
private boolean isEndIconChecked = false;
private long dropdownPopupActivatedAt = Long.MAX_VALUE;
@Nullable private AccessibilityManager accessibilityManager;
private ValueAnimator fadeOutAnim;
private ValueAnimator fadeInAnim;
DropdownMenuEndIconDelegate(
@NonNull EndCompoundLayout endLayout, @DrawableRes int customEndIcon) {
super(endLayout, customEndIcon);
}
@Override
void setUp() {
// For lollipop+, the arrow icon changes orientation based on dropdown popup, otherwise it
// always points down.
int drawableResId =
customEndIcon == 0
? (IS_LOLLIPOP ? R.drawable.mtrl_dropdown_arrow : R.drawable.mtrl_ic_arrow_drop_down)
: customEndIcon;
endLayout.setEndIconDrawable(drawableResId);
endLayout.setEndIconContentDescription(
endLayout.getResources().getText(R.string.exposed_dropdown_menu_content_description));
initAnimators();
accessibilityManager =
(AccessibilityManager) context.getSystemService(Context.ACCESSIBILITY_SERVICE);
if (VERSION.SDK_INT >= VERSION_CODES.KITKAT) {
accessibilityManager.addTouchExplorationStateChangeListener(enabled -> {
if (autoCompleteTextView != null && !isEditable(autoCompleteTextView)) {
ViewCompat.setImportantForAccessibility(
endIconView,
enabled ? IMPORTANT_FOR_ACCESSIBILITY_NO : IMPORTANT_FOR_ACCESSIBILITY_YES);
}
});
}
}
@SuppressLint("ClickableViewAccessibility") // There's an accessibility delegate that handles
// interactions with the dropdown menu.
@Override
void tearDown() {
if (autoCompleteTextView != null) {
// Remove any listeners set on the edit text.
autoCompleteTextView.setOnTouchListener(null);
if (IS_LOLLIPOP) {
autoCompleteTextView.setOnDismissListener(null);
}
}
}
@Override
boolean shouldTintIconOnError() {
return true;
}
@Override
boolean isBoxBackgroundModeSupported(@BoxBackgroundMode int boxBackgroundMode) {
return boxBackgroundMode != TextInputLayout.BOX_BACKGROUND_NONE;
}
@Override
OnClickListener getOnIconClickListener() {
return onIconClickListener;
}
@Override
public void onEditTextAttached(@Nullable EditText editText) {
this.autoCompleteTextView = castAutoCompleteTextViewOrThrow(editText);
setUpDropdownShowHideBehavior();
textInputLayout.setEndIconCheckable(true);
textInputLayout.setErrorIconDrawable(null);
if (!isEditable(editText) && accessibilityManager.isTouchExplorationEnabled()) {
ViewCompat.setImportantForAccessibility(endIconView, IMPORTANT_FOR_ACCESSIBILITY_NO);
}
textInputLayout.setTextInputAccessibilityDelegate(accessibilityDelegate);
textInputLayout.setEndIconVisible(true);
}
@Override
public void afterEditTextChanged(Editable s) {
// Don't show dropdown list if we're in a11y mode and the menu is editable.
if (accessibilityManager.isTouchExplorationEnabled()
&& isEditable(autoCompleteTextView)
&& !endIconView.hasFocus()) {
autoCompleteTextView.dismissDropDown();
}
autoCompleteTextView.post(() -> {
boolean isPopupShowing = autoCompleteTextView.isPopupShowing();
setEndIconChecked(isPopupShowing);
dropdownPopupDirty = isPopupShowing;
});
}
@Override
OnFocusChangeListener getOnEditTextFocusChangeListener() {
return onEditTextFocusChangeListener;
}
private void showHideDropdown() {
if (autoCompleteTextView == null) {
return;
}
if (isDropdownPopupActive()) {
dropdownPopupDirty = false;
}
if (!dropdownPopupDirty) {
if (IS_LOLLIPOP) {
setEndIconChecked(!isEndIconChecked);
} else {
isEndIconChecked = !isEndIconChecked;
endIconView.toggle();
}
if (isEndIconChecked) {
autoCompleteTextView.requestFocus();
autoCompleteTextView.showDropDown();
} else {
autoCompleteTextView.dismissDropDown();
}
} else {
dropdownPopupDirty = false;
}
}
@SuppressLint("ClickableViewAccessibility") // There's an accessibility delegate that handles
// interactions with the dropdown menu.
private void setUpDropdownShowHideBehavior() {
// Set whole layout clickable.
autoCompleteTextView.setOnTouchListener((view, event) -> {
if (event.getAction() == MotionEvent.ACTION_UP) {
if (isDropdownPopupActive()) {
dropdownPopupDirty = false;
}
showHideDropdown();
updateDropdownPopupDirty();
}
return false;
});
if (IS_LOLLIPOP) {
autoCompleteTextView.setOnDismissListener(() -> {
updateDropdownPopupDirty();
setEndIconChecked(false);
});
}
autoCompleteTextView.setThreshold(0);
}
private boolean isDropdownPopupActive() {
long activeFor = System.currentTimeMillis() - dropdownPopupActivatedAt;
return activeFor < 0 || activeFor > 300;
}
@NonNull
private static AutoCompleteTextView castAutoCompleteTextViewOrThrow(EditText editText) {
if (!(editText instanceof AutoCompleteTextView)) {
throw new RuntimeException(
"EditText needs to be an AutoCompleteTextView if an Exposed Dropdown Menu is being"
+ " used.");
}
return (AutoCompleteTextView) editText;
}
private void updateDropdownPopupDirty() {
dropdownPopupDirty = true;
dropdownPopupActivatedAt = System.currentTimeMillis();
}
private void setEndIconChecked(boolean checked) {
if (isEndIconChecked != checked) {
isEndIconChecked = checked;
fadeInAnim.cancel();
fadeOutAnim.start();
}
}
private void initAnimators() {
fadeInAnim = getAlphaAnimator(ANIMATION_FADE_IN_DURATION, 0, 1);
fadeOutAnim = getAlphaAnimator(ANIMATION_FADE_OUT_DURATION, 1, 0);
fadeOutAnim.addListener(
new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
endIconView.setChecked(isEndIconChecked);
fadeInAnim.start();
}
});
}
private ValueAnimator getAlphaAnimator(int duration, float... values) {
ValueAnimator animator = ValueAnimator.ofFloat(values);
animator.setInterpolator(AnimationUtils.LINEAR_INTERPOLATOR);
animator.setDuration(duration);
animator.addUpdateListener(animation -> {
float alpha = (float) animation.getAnimatedValue();
endIconView.setAlpha(alpha);
});
return animator;
}
}