TextFieldGestureModifiers.kt
/*
* Copyright 2021 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 androidx.compose.foundation.text
import androidx.compose.foundation.focusable
import androidx.compose.foundation.gestures.awaitFirstDown
import androidx.compose.foundation.gestures.drag
import androidx.compose.foundation.gestures.forEachGesture
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.ui.Modifier
import androidx.compose.ui.focus.FocusRequester
import androidx.compose.ui.focus.FocusState
import androidx.compose.ui.focus.focusRequester
import androidx.compose.ui.focus.onFocusChanged
import androidx.compose.ui.input.pointer.PointerInputScope
import androidx.compose.ui.input.pointer.consumeAllChanges
import androidx.compose.ui.input.pointer.consumeDownChange
import androidx.compose.ui.input.pointer.pointerInput
import androidx.compose.ui.input.pointer.positionChange
// Touch selection
internal fun Modifier.longPressDragGestureFilter(
observer: TextDragObserver,
enabled: Boolean
) = if (enabled) {
this.pointerInput(observer) { detectDragGesturesAfterLongPressWithObserver(observer) }
} else {
this
}
// Focus modifiers
internal fun Modifier.textFieldFocusModifier(
enabled: Boolean,
focusRequester: FocusRequester,
interactionSource: MutableInteractionSource?,
onFocusChanged: (FocusState) -> Unit
) = this
.focusRequester(focusRequester)
.onFocusChanged(onFocusChanged)
.focusable(interactionSource = interactionSource, enabled = enabled)
// Mouse
internal fun Modifier.mouseDragGestureFilter(dragObserver: TextDragObserver, enabled: Boolean) =
if (enabled) {
this.pointerInput(dragObserver) {
forEachGesture {
awaitPointerEventScope {
val down = awaitFirstDown(requireUnconsumed = false)
down.consumeDownChange()
dragObserver.onStart(down.position)
drag(down.id) { event ->
dragObserver.onDrag(event.positionChange())
event.consumeAllChanges()
}
// specifically don't call observer.onStop/onCancel for mouse case
}
}
}
} else {
this
}
internal fun Modifier.mouseDragGestureDetector(
detector: suspend PointerInputScope.() -> Unit,
enabled: Boolean
) = if (enabled) Modifier.pointerInput(Unit, detector) else this