| /* |
| * 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.LayoutNode.LayoutState.Ready |
| import androidx.ui.core.focus.ModifiedFocusNode |
| import androidx.ui.core.keyinput.ModifiedKeyInputNode |
| import androidx.ui.core.pointerinput.PointerInputFilter |
| import androidx.ui.geometry.Offset |
| import androidx.ui.graphics.Canvas |
| import androidx.ui.graphics.Color |
| import androidx.ui.graphics.Paint |
| import androidx.ui.graphics.PaintingStyle |
| import androidx.ui.unit.Density |
| import androidx.ui.unit.IntOffset |
| import androidx.ui.util.fastAny |
| import androidx.ui.util.fastForEach |
| |
| @OptIn(ExperimentalLayoutNodeApi::class) |
| internal class InnerPlaceable( |
| layoutNode: LayoutNode |
| ) : LayoutNodeWrapper(layoutNode), Density by layoutNode.measureScope { |
| |
| override val providedAlignmentLines: Set<AlignmentLine> |
| get() = layoutNode.providedAlignmentLines.keys |
| override val isAttached: Boolean |
| get() = layoutNode.isAttached() |
| |
| override val measureScope get() = layoutNode.measureScope |
| |
| override fun performMeasure( |
| constraints: Constraints, |
| layoutDirection: LayoutDirection |
| ): Placeable { |
| layoutNode.layoutDirection = layoutDirection |
| val measureResult = layoutNode.measureBlocks.measure( |
| layoutNode.measureScope, |
| layoutNode.children, |
| constraints, |
| measureScope.layoutDirection |
| ) |
| layoutNode.handleMeasureResult(measureResult) |
| return this |
| } |
| |
| override val parentData: Any? |
| get() = null |
| |
| override fun findPreviousFocusWrapper() = wrappedBy?.findPreviousFocusWrapper() |
| |
| override fun findNextFocusWrapper() = null |
| |
| override fun findLastFocusWrapper(): ModifiedFocusNode? = findPreviousFocusWrapper() |
| |
| override fun findPreviousKeyInputWrapper() = wrappedBy?.findPreviousKeyInputWrapper() |
| |
| override fun findNextKeyInputWrapper() = null |
| |
| override fun findLastKeyInputWrapper(): ModifiedKeyInputNode? = findPreviousKeyInputWrapper() |
| |
| override fun minIntrinsicWidth(height: Int, layoutDirection: LayoutDirection): Int { |
| return layoutNode.measureBlocks.minIntrinsicWidth( |
| measureScope, |
| layoutNode.children, |
| height, |
| layoutDirection |
| ) |
| } |
| |
| override fun minIntrinsicHeight(width: Int, layoutDirection: LayoutDirection): Int { |
| return layoutNode.measureBlocks.minIntrinsicHeight( |
| measureScope, |
| layoutNode.children, |
| width, |
| layoutDirection |
| ) |
| } |
| |
| override fun maxIntrinsicWidth(height: Int, layoutDirection: LayoutDirection): Int { |
| return layoutNode.measureBlocks.maxIntrinsicWidth( |
| measureScope, |
| layoutNode.children, |
| height, |
| layoutDirection |
| ) |
| } |
| |
| override fun maxIntrinsicHeight(width: Int, layoutDirection: LayoutDirection): Int { |
| return layoutNode.measureBlocks.maxIntrinsicHeight( |
| measureScope, |
| layoutNode.children, |
| width, |
| layoutDirection |
| ) |
| } |
| |
| override fun place(position: IntOffset) { |
| this.position = position |
| |
| // The wrapper only runs their placement block to obtain our position, which allows them |
| // to calculate the offset of an alignment line we have already provided a position for. |
| // No need to place our wrapped as well (we might have actually done this already in |
| // get(line), to obtain the position of the alignment line the wrapper currently needs |
| // our position in order ot know how to offset the value we provided). |
| if (wrappedBy?.isShallowPlacing == true) return |
| |
| layoutNode.isPlaced = true |
| layoutNode.layoutChildren() |
| } |
| |
| override operator fun get(line: AlignmentLine): Int { |
| return layoutNode.calculateAlignmentLines()[line] ?: AlignmentLine.Unspecified |
| } |
| |
| override fun draw(canvas: Canvas) { |
| withPositionTranslation(canvas) { |
| val owner = layoutNode.requireOwner() |
| layoutNode.zIndexSortedChildren.fastForEach { child -> |
| if (child.isPlaced) { |
| require(child.layoutState == Ready) { |
| "$child is not ready. layoutState is ${child.layoutState}" |
| } |
| child.draw(canvas) |
| } |
| } |
| if (owner.showLayoutBounds) { |
| drawBorder(canvas, innerBoundsPaint) |
| } |
| } |
| } |
| |
| override fun hitTest( |
| pointerPositionRelativeToScreen: Offset, |
| hitPointerInputFilters: MutableList<PointerInputFilter> |
| ) { |
| // Any because as soon as true is returned, we know we have found a hit path and we must |
| // not add PointerInputFilters on different paths so we should not even go looking. |
| val originalSize = hitPointerInputFilters.size |
| layoutNode.zIndexSortedChildren.reversed().fastAny { child -> |
| callHitTest(child, pointerPositionRelativeToScreen, hitPointerInputFilters) |
| hitPointerInputFilters.size > originalSize |
| } |
| } |
| |
| override fun attach() { |
| // Do nothing. InnerPlaceable only is attached when the LayoutNode is attached. |
| } |
| |
| override fun detach() { |
| // Do nothing. InnerPlaceable only is detached when the LayoutNode is detached. |
| } |
| |
| internal companion object { |
| val innerBoundsPaint = Paint().also { paint -> |
| paint.color = Color.Red |
| paint.strokeWidth = 1f |
| paint.style = PaintingStyle.stroke |
| } |
| |
| private fun callHitTest( |
| node: LayoutNode, |
| globalPoint: Offset, |
| hitPointerInputFilters: MutableList<PointerInputFilter> |
| ) { |
| node.hitTest(globalPoint, hitPointerInputFilters) |
| } |
| } |
| } |