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Public Member Functions | Static Public Attributes | List of all members
flutter::PlatformViewAndroidDelegate Class Reference

#include <platform_view_android_delegate.h>

Public Member Functions

 PlatformViewAndroidDelegate (std::shared_ptr< PlatformViewAndroidJNI > jni_facade)
 
void UpdateSemantics (const flutter::SemanticsNodeUpdates &update, const flutter::CustomAccessibilityActionUpdates &actions)
 

Static Public Attributes

static constexpr size_t kBytesPerNode
 
static constexpr size_t kBytesPerChild = sizeof(int32_t)
 
static constexpr size_t kBytesPerCustomAction = sizeof(int32_t)
 
static constexpr size_t kBytesPerAction = 4 * sizeof(int32_t)
 
static constexpr size_t kBytesPerStringAttribute = 4 * sizeof(int32_t)
 
static constexpr int kEmptyStringIndex = -1
 

Detailed Description

Definition at line 17 of file platform_view_android_delegate.h.

Constructor & Destructor Documentation

◆ PlatformViewAndroidDelegate()

flutter::PlatformViewAndroidDelegate::PlatformViewAndroidDelegate ( std::shared_ptr< PlatformViewAndroidJNI >  jni_facade)
explicit

Definition at line 154 of file platform_view_android_delegate.cc.

156 : jni_facade_(std::move(jni_facade)) {};

Member Function Documentation

◆ UpdateSemantics()

void flutter::PlatformViewAndroidDelegate::UpdateSemantics ( const flutter::SemanticsNodeUpdates &  update,
const flutter::CustomAccessibilityActionUpdates &  actions 
)

Definition at line 158 of file platform_view_android_delegate.cc.

160 {
161 {
162 size_t num_bytes = 0;
163 for (const auto& value : update) {
164 num_bytes += kBytesPerNode;
165 num_bytes +=
166 value.second.childrenInTraversalOrder.size() * kBytesPerChild;
167 num_bytes += value.second.childrenInHitTestOrder.size() * kBytesPerChild;
168 num_bytes += value.second.customAccessibilityActions.size() *
169 kBytesPerCustomAction;
170 num_bytes +=
171 value.second.labelAttributes.size() * kBytesPerStringAttribute;
172 num_bytes +=
173 value.second.valueAttributes.size() * kBytesPerStringAttribute;
174 num_bytes += value.second.increasedValueAttributes.size() *
175 kBytesPerStringAttribute;
176 num_bytes += value.second.decreasedValueAttributes.size() *
177 kBytesPerStringAttribute;
178 num_bytes +=
179 value.second.hintAttributes.size() * kBytesPerStringAttribute;
180 }
181 // The encoding defined here is used in:
182 //
183 // * AccessibilityBridge.java
184 // * AccessibilityBridgeTest.java
185 // * accessibility_bridge.mm
186 //
187 // If any of the encoding structure or length is changed, those locations
188 // must be updated (at a minimum).
189 std::vector<uint8_t> buffer(num_bytes);
190 std::vector<std::string> strings;
191 std::vector<std::vector<uint8_t>> string_attribute_args;
192
193 if (!buffer.empty()) {
194 int32_t* buffer_int32 = reinterpret_cast<int32_t*>(buffer.data());
195 float* buffer_float32 = reinterpret_cast<float*>(buffer.data());
196
197 size_t position = 0;
198 for (const auto& value : update) {
199 // If you edit this code, make sure you update kBytesPerNode
200 // and/or kBytesPerChild above to match the number of values you are
201 // sending.
202 const flutter::SemanticsNode& node = value.second;
203 buffer_int32[position++] = node.id;
204 int64_t flags = flagsToInt64(node.flags);
205 std::memcpy(&buffer_int32[position], &flags, 8);
206 position += 2;
207 buffer_int32[position++] = node.actions;
208 buffer_int32[position++] = node.maxValueLength;
209 buffer_int32[position++] = node.currentValueLength;
210 buffer_int32[position++] = node.textSelectionBase;
211 buffer_int32[position++] = node.textSelectionExtent;
212 buffer_int32[position++] = node.platformViewId;
213 buffer_int32[position++] = node.scrollChildren;
214 buffer_int32[position++] = node.scrollIndex;
215 buffer_int32[position++] = node.traversalParent;
216 buffer_float32[position++] = static_cast<float>(node.scrollPosition);
217 buffer_float32[position++] = static_cast<float>(node.scrollExtentMax);
218 buffer_float32[position++] = static_cast<float>(node.scrollExtentMin);
219 buffer_int32[position++] = static_cast<int32_t>(node.role);
220
221 putStringIntoBuffer(node.identifier, buffer_int32, &position, strings);
222
223 putStringIntoBuffer(node.label, buffer_int32, &position, strings);
224 putStringAttributesIntoBuffer(node.labelAttributes, buffer_int32,
225 &position, string_attribute_args);
226
227 putStringIntoBuffer(node.value, buffer_int32, &position, strings);
228 putStringAttributesIntoBuffer(node.valueAttributes, buffer_int32,
229 &position, string_attribute_args);
230
231 putStringIntoBuffer(node.increasedValue, buffer_int32, &position,
232 strings);
233 putStringAttributesIntoBuffer(node.increasedValueAttributes,
234 buffer_int32, &position,
235 string_attribute_args);
236
237 putStringIntoBuffer(node.decreasedValue, buffer_int32, &position,
238 strings);
239 putStringAttributesIntoBuffer(node.decreasedValueAttributes,
240 buffer_int32, &position,
241 string_attribute_args);
242
243 putStringIntoBuffer(node.hint, buffer_int32, &position, strings);
244 putStringAttributesIntoBuffer(node.hintAttributes, buffer_int32,
245 &position, string_attribute_args);
246
247 putStringIntoBuffer(node.tooltip, buffer_int32, &position, strings);
248 putStringIntoBuffer(node.linkUrl, buffer_int32, &position, strings);
249 putStringIntoBuffer(node.locale, buffer_int32, &position, strings);
250 putStringIntoBuffer(node.minValue, buffer_int32, &position, strings);
251 putStringIntoBuffer(node.maxValue, buffer_int32, &position, strings);
252
253 buffer_int32[position++] = node.headingLevel;
254 buffer_int32[position++] = node.textDirection;
255 buffer_float32[position++] = node.rect.left();
256 buffer_float32[position++] = node.rect.top();
257 buffer_float32[position++] = node.rect.right();
258 buffer_float32[position++] = node.rect.bottom();
259 node.transform.getColMajor(&buffer_float32[position]);
260 position += 16;
261 node.hitTestTransform.getColMajor(&buffer_float32[position]);
262 position += 16;
263 buffer_int32[position++] = node.childrenInTraversalOrder.size();
264 for (int32_t child : node.childrenInTraversalOrder) {
265 buffer_int32[position++] = child;
266 }
267
268 buffer_int32[position++] = node.childrenInHitTestOrder.size();
269 for (int32_t child : node.childrenInHitTestOrder) {
270 buffer_int32[position++] = child;
271 }
272
273 buffer_int32[position++] = node.customAccessibilityActions.size();
274 for (int32_t child : node.customAccessibilityActions) {
275 buffer_int32[position++] = child;
276 }
277 }
278 }
279
280 // custom accessibility actions.
281 size_t num_action_bytes = actions.size() * kBytesPerAction;
282 std::vector<uint8_t> actions_buffer(num_action_bytes);
283
284 if (!actions_buffer.empty()) {
285 int32_t* actions_buffer_int32 =
286 reinterpret_cast<int32_t*>(actions_buffer.data());
287
288 std::vector<std::string> action_strings;
289 size_t actions_position = 0;
290 for (const auto& value : actions) {
291 // If you edit this code, make sure you update kBytesPerAction
292 // to match the number of values you are
293 // sending.
294 const flutter::CustomAccessibilityAction& action = value.second;
295 actions_buffer_int32[actions_position++] = action.id;
296 actions_buffer_int32[actions_position++] = action.overrideId;
297 putStringIntoBuffer(action.label, actions_buffer_int32,
298 &actions_position, action_strings);
299 putStringIntoBuffer(action.hint, actions_buffer_int32,
300 &actions_position, action_strings);
301 }
302 // Calling NewDirectByteBuffer in API level 22 and below with a size of
303 // zero will cause a JNI crash.
304 jni_facade_->FlutterViewUpdateCustomAccessibilityActions(actions_buffer,
305 action_strings);
306 }
307
308 if (!buffer.empty()) {
309 jni_facade_->FlutterViewUpdateSemantics(buffer, strings,
310 string_attribute_args);
311 }
312 }
313}
value
int32_t value
Definition dl_golden_unittests.cc:483
action
int action
Definition keyboard_key_handler_unittests.cc:116
flutter::buffer
DEF_SWITCHES_START aot vmservice shared library Name of the *so containing AOT compiled Dart assets for launching the service isolate vm snapshot The VM snapshot data that will be memory mapped as read only SnapshotAssetPath must be present isolate snapshot The isolate snapshot data that will be memory mapped as read only SnapshotAssetPath must be present cache dir Path to the cache directory This is different from the persistent_cache_path in embedder which is used for Skia shader cache icu native lib Path to the library file that exports the ICU data vm service The hostname IP address on which the Dart VM Service should be served If not defaults to or::depending on whether ipv6 is specified disable vm Disable the Dart VM Service The Dart VM Service is never available in release mode Bind to the IPv6 localhost address for the Dart VM Service Ignored if vm service host is set profile Make the profiler discard new samples once the profiler sample buffer is full When this flag is not the profiler sample buffer is used as a ring buffer
Definition switch_defs.h:98
flutter::SemanticsNode::decreasedValueAttributes
StringAttributes decreasedValueAttributes
Definition semantics_node.h:160
flutter::SemanticsNode::hintAttributes
StringAttributes hintAttributes
Definition semantics_node.h:154
flutter::SemanticsNode::increasedValueAttributes
StringAttributes increasedValueAttributes
Definition semantics_node.h:158
flutter::SemanticsNode::valueAttributes
StringAttributes valueAttributes
Definition semantics_node.h:156
flutter::SemanticsNode::labelAttributes
StringAttributes labelAttributes
Definition semantics_node.h:152
flutter::SemanticsNode::childrenInHitTestOrder
std::vector< int32_t > childrenInHitTestOrder
Definition semantics_node.h:168
flutter::SemanticsNode::customAccessibilityActions
std::vector< int32_t > customAccessibilityActions
Definition semantics_node.h:169
flutter::SemanticsNode::childrenInTraversalOrder
std::vector< int32_t > childrenInTraversalOrder
Definition semantics_node.h:167

References action, flutter::SemanticsNode::actions, flutter::buffer, flutter::SemanticsNode::childrenInHitTestOrder, flutter::SemanticsNode::childrenInTraversalOrder, flutter::SemanticsNode::currentValueLength, flutter::SemanticsNode::customAccessibilityActions, flutter::SemanticsNode::decreasedValue, flutter::SemanticsNode::decreasedValueAttributes, flutter::SemanticsNode::flags, flutter::SemanticsNode::headingLevel, flutter::SemanticsNode::hint, flutter::SemanticsNode::hintAttributes, flutter::SemanticsNode::hitTestTransform, flutter::SemanticsNode::id, flutter::SemanticsNode::identifier, flutter::SemanticsNode::increasedValue, flutter::SemanticsNode::increasedValueAttributes, kBytesPerAction, kBytesPerChild, kBytesPerCustomAction, kBytesPerNode, kBytesPerStringAttribute, flutter::SemanticsNode::label, flutter::SemanticsNode::labelAttributes, flutter::SemanticsNode::linkUrl, flutter::SemanticsNode::locale, flutter::SemanticsNode::maxValue, flutter::SemanticsNode::maxValueLength, flutter::SemanticsNode::minValue, flutter::SemanticsNode::platformViewId, flutter::SemanticsNode::rect, flutter::SemanticsNode::role, flutter::SemanticsNode::scrollChildren, flutter::SemanticsNode::scrollExtentMax, flutter::SemanticsNode::scrollExtentMin, flutter::SemanticsNode::scrollIndex, flutter::SemanticsNode::scrollPosition, flutter::SemanticsNode::textDirection, flutter::SemanticsNode::textSelectionBase, flutter::SemanticsNode::textSelectionExtent, flutter::SemanticsNode::tooltip, flutter::SemanticsNode::transform, flutter::SemanticsNode::traversalParent, value, flutter::SemanticsNode::value, and flutter::SemanticsNode::valueAttributes.

Member Data Documentation

◆ kBytesPerAction

constexpr size_t flutter::PlatformViewAndroidDelegate::kBytesPerAction = 4 * sizeof(int32_t)
staticconstexpr

Definition at line 23 of file platform_view_android_delegate.h.

Referenced by flutter::testing::TEST(), and UpdateSemantics().

◆ kBytesPerChild

constexpr size_t flutter::PlatformViewAndroidDelegate::kBytesPerChild = sizeof(int32_t)
staticconstexpr

Definition at line 21 of file platform_view_android_delegate.h.

Referenced by UpdateSemantics().

◆ kBytesPerCustomAction

constexpr size_t flutter::PlatformViewAndroidDelegate::kBytesPerCustomAction = sizeof(int32_t)
staticconstexpr

Definition at line 22 of file platform_view_android_delegate.h.

Referenced by UpdateSemantics().

◆ kBytesPerNode

constexpr size_t flutter::PlatformViewAndroidDelegate::kBytesPerNode
staticconstexpr
Initial value:
=
73 * sizeof(int32_t)

Definition at line 19 of file platform_view_android_delegate.h.

Referenced by flutter::testing::TEST(), flutter::testing::TEST(), flutter::testing::TEST(), flutter::testing::TEST(), and UpdateSemantics().

◆ kBytesPerStringAttribute

constexpr size_t flutter::PlatformViewAndroidDelegate::kBytesPerStringAttribute = 4 * sizeof(int32_t)
staticconstexpr

Definition at line 24 of file platform_view_android_delegate.h.

Referenced by flutter::testing::TEST(), and UpdateSemantics().

◆ kEmptyStringIndex

constexpr int flutter::PlatformViewAndroidDelegate::kEmptyStringIndex = -1
staticconstexpr

Definition at line 25 of file platform_view_android_delegate.h.

The documentation for this class was generated from the following files: