| /* |
| * Copyright 2020 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.ui.core |
| |
| import androidx.ui.core.focus.ModifiedFocusNode |
| import androidx.ui.core.pointerinput.PointerInputFilter |
| import androidx.ui.graphics.Canvas |
| import androidx.ui.unit.IntPx |
| import androidx.ui.unit.IntPxPosition |
| import androidx.ui.unit.PxPosition |
| import androidx.ui.unit.ipx |
| import androidx.ui.unit.round |
| import androidx.ui.unit.toPx |
| |
| /** |
| * [LayoutNodeWrapper] with default implementations for methods. |
| */ |
| internal open class DelegatingLayoutNodeWrapper<T : Modifier.Element>( |
| override val wrapped: LayoutNodeWrapper, |
| val modifier: T |
| ) : LayoutNodeWrapper(wrapped.layoutNode) { |
| override val providedAlignmentLines: Set<AlignmentLine> |
| get() = wrapped.providedAlignmentLines |
| |
| private var _isAttached = true |
| override val isAttached: Boolean |
| get() = _isAttached && layoutNode.isAttached() |
| |
| override val measureScope: MeasureScope get() = wrapped.measureScope |
| |
| init { |
| wrapped.wrappedBy = this |
| } |
| |
| override fun draw(canvas: Canvas) { |
| withPositionTranslation(canvas) { |
| wrapped.draw(canvas) |
| } |
| } |
| |
| override fun hitTest( |
| pointerPositionRelativeToScreen: PxPosition, |
| hitPointerInputFilters: MutableList<PointerInputFilter> |
| ): Boolean { |
| if (isGlobalPointerInBounds(pointerPositionRelativeToScreen)) { |
| return wrapped.hitTest(pointerPositionRelativeToScreen, hitPointerInputFilters) |
| } else { |
| // Anything out of bounds of ourselves can't be hit. |
| return false |
| } |
| } |
| |
| override fun get(line: AlignmentLine): IntPx? { |
| val value = wrapped[line] ?: return null |
| val px = value.toPx() |
| val pos = wrapped.toParentPosition(PxPosition(px, px)) |
| return if (line is HorizontalAlignmentLine) pos.y.round() else pos.y.round() |
| } |
| |
| override fun place(position: IntPxPosition) { |
| this.position = position |
| with(InnerPlacementScope) { |
| this.parentLayoutDirection = measureScope.layoutDirection |
| val previousParentWidth = parentWidth |
| parentWidth = measuredSize.width |
| measureResult.placeChildren(measureScope.layoutDirection) |
| parentWidth = previousParentWidth |
| } |
| } |
| |
| override fun performMeasure( |
| constraints: Constraints, |
| layoutDirection: LayoutDirection |
| ): Placeable { |
| val placeable = wrapped.measure(constraints, layoutDirection) |
| measureResult = object : MeasureScope.MeasureResult { |
| override val width: IntPx = wrapped.measureResult.width |
| override val height: IntPx = wrapped.measureResult.height |
| override val alignmentLines: Map<AlignmentLine, IntPx> = emptyMap() |
| override fun placeChildren(layoutDirection: LayoutDirection) { |
| with(InnerPlacementScope) { |
| placeable.placeAbsolute(-apparentToRealOffset) |
| } |
| } |
| } |
| return this |
| } |
| |
| override fun findFocusWrapperWrappingThisWrapper() = |
| wrappedBy?.findFocusWrapperWrappingThisWrapper() |
| |
| override fun findFocusWrapperWrappedByThisWrapper() = |
| wrapped.findFocusWrapperWrappedByThisWrapper() |
| |
| override fun findLastFocusWrapper(): ModifiedFocusNode? { |
| var lastFocusWrapper: ModifiedFocusNode? = null |
| |
| // Find last focus wrapper for the current layout node. |
| var next: ModifiedFocusNode? = findFocusWrapperWrappedByThisWrapper() |
| while (next != null) { |
| lastFocusWrapper = next |
| next = next.wrapped.findFocusWrapperWrappedByThisWrapper() |
| } |
| return lastFocusWrapper |
| } |
| |
| override fun minIntrinsicWidth(height: IntPx, layoutDirection: LayoutDirection) = |
| wrapped.minIntrinsicWidth(height, layoutDirection) |
| override fun maxIntrinsicWidth(height: IntPx, layoutDirection: LayoutDirection) = |
| wrapped.maxIntrinsicWidth(height, layoutDirection) |
| override fun minIntrinsicHeight(width: IntPx, layoutDirection: LayoutDirection) = |
| wrapped.minIntrinsicHeight(width, layoutDirection) |
| override fun maxIntrinsicHeight(width: IntPx, layoutDirection: LayoutDirection) = |
| wrapped.maxIntrinsicHeight(width, layoutDirection) |
| override val parentData: Any? get() = wrapped.parentData |
| |
| override fun attach() { |
| wrapped.attach() |
| _isAttached = true |
| } |
| |
| override fun detach() { |
| _isAttached = false |
| wrapped.detach() |
| } |
| } |
| |
| internal object InnerPlacementScope : Placeable.PlacementScope() { |
| override var parentWidth = 0.ipx |
| override var parentLayoutDirection = LayoutDirection.Ltr |
| } |