1 /* Copyright (c) 2019 Samsung Electronics Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
18 using System.ComponentModel;
19 using Tizen.NUI.BaseComponents;
20 using System.Runtime.InteropServices;
21 using System.Diagnostics;
22 using Tizen.NUI.Binding;
27 /// This class implements a flex layout.
28 /// The flex layout implementation is based on open source Facebook Yoga layout engine.
29 /// For more information about the flex layout API and how to use it please refer to https://yogalayout.com/docs/
30 /// We implement the subset of the API in the class below.
32 public class FlexLayout : LayoutGroup, global::System.IDisposable
37 [EditorBrowsable(EditorBrowsableState.Never)]
38 internal static readonly BindableProperty FlexItemProperty = BindableProperty.CreateAttached("FlexItem", typeof(HandleRef), typeof(FlexLayout), default(HandleRef));
41 /// FlexAlignmentSelfProperty
43 [EditorBrowsable(EditorBrowsableState.Never)]
44 public static readonly BindableProperty FlexAlignmentSelfProperty = BindableProperty.CreateAttached("FlexAlignmentSelf", typeof(AlignmentType), typeof(FlexLayout), AlignmentType.Auto, propertyChanged: OnChildPropertyChanged);
47 /// FlexPositionTypeProperty
49 [EditorBrowsable(EditorBrowsableState.Never)]
50 public static readonly BindableProperty FlexPositionTypeProperty = BindableProperty.CreateAttached("FlexPositionType", typeof(PositionType), typeof(FlexLayout), PositionType.Relative, propertyChanged: OnChildPropertyChanged);
53 /// AspectRatioProperty
55 [EditorBrowsable(EditorBrowsableState.Never)]
56 public static readonly BindableProperty FlexAspectRatioProperty = BindableProperty.CreateAttached("FlexAspectRatio", typeof(float), typeof(FlexLayout), FlexUndefined, validateValue: (bindable, value) => (float)value > 0, propertyChanged: OnChildPropertyChanged);
61 [EditorBrowsable(EditorBrowsableState.Never)]
62 public static readonly BindableProperty FlexBasisProperty = BindableProperty.CreateAttached("FlexBasis", typeof(float), typeof(FlexLayout), FlexUndefined, validateValue: (bindable, value) => (float)value >= 0, propertyChanged: OnChildPropertyChanged);
65 /// FlexShrinkProperty
67 [EditorBrowsable(EditorBrowsableState.Never)]
68 public static readonly BindableProperty FlexShrinkProperty = BindableProperty.CreateAttached("FlexShrink", typeof(float), typeof(FlexLayout), 1.0f, validateValue: (bindable, value) => (float)value >= 0, propertyChanged: OnChildPropertyChanged);
73 [EditorBrowsable(EditorBrowsableState.Never)]
74 public static readonly BindableProperty FlexGrowProperty = BindableProperty.CreateAttached("FlexGrow", typeof(float), typeof(FlexLayout), FlexUndefined, validateValue: (bindable, value) => (float)value >= 0, propertyChanged: OnChildPropertyChanged);
76 private static bool LayoutDebugFlex = false; // Debug flag
78 private global::System.Runtime.InteropServices.HandleRef swigCPtr;
79 private bool swigCMemOwn;
80 private bool disposed;
81 private bool isDisposeQueued = false;
83 private MeasureSpecification parentMeasureSpecificationWidth;
84 private MeasureSpecification parentMeasureSpecificationHeight;
86 private IntPtr _rootFlex; // Pointer to the unmanged flex layout class.
88 internal const float FlexUndefined = 10E20F; // Auto setting which is equivalent to WrapContent.
90 internal struct MeasuredSize
92 public MeasuredSize(float x, float y)
102 /// Gets the alignment self of the child view.
104 /// <seealso cref="SetFlexAlignmentSelf(View, AlignmentType)"/>
105 /// <param name="view">The child view.</param>
106 /// <returns> The value of alignment self.</returns>
107 /// <since_tizen> 8 </since_tizen>
108 public static AlignmentType GetFlexAlignmentSelf(View view)
110 return (AlignmentType)view.GetValue(FlexAlignmentSelfProperty);
114 /// Gets the position type of the child view.
116 /// <seealso cref="SetFlexPositionType(View, PositionType)"/>
117 /// <param name="view">The child view.</param>
118 /// <returns> The value of position type</returns>
119 /// <since_tizen> 8 </since_tizen>
120 public static PositionType GetFlexPositionType(View view)
122 return (PositionType)view.GetValue(FlexPositionTypeProperty);
126 /// Gets the aspect ratio of the child view.
128 /// <seealso cref="SetFlexAspectRatio(View, float)"/>
129 /// <param name="view">The child view.</param>
130 /// <returns> The value of aspect ratio</returns>
131 /// <since_tizen> 8 </since_tizen>
132 public static float GetFlexAspectRatio(View view)
134 return (float)view.GetValue(FlexAspectRatioProperty);
138 /// Gets the basis of the child view.
140 /// <seealso cref="SetFlexBasis(View, float)"/>
141 /// <param name="view">The child view.</param>
142 /// <returns> The value of basis</returns>
143 /// <since_tizen> 8 </since_tizen>
144 public static float GetFlexBasis(View view)
146 return (float)view.GetValue(FlexBasisProperty);
150 /// Gets the shrink of the child view.
152 /// <seealso cref="SetFlexShrink(View, float)"/>
153 /// <param name="view">The child view.</param>
154 /// <returns> The value of shrink</returns>
155 /// <since_tizen> 8 </since_tizen>
156 public static float GetFlexShrink(View view)
158 return (float)view.GetValue(FlexShrinkProperty);
162 /// Gets the grow of the child view.
164 /// <seealso cref="SetFlexGrow(View, float)"/>
165 /// <param name="view">The child view.</param>
166 /// <returns> The value of grow</returns>
167 /// <since_tizen> 8 </since_tizen>
168 public static float GetFlexGrow(View view)
170 return (float)view.GetValue(FlexGrowProperty);
174 /// Sets the alignment self of the child view.<br/>
175 /// Alignment self has the same options and effect as <see cref="ItemsAlignment"/> but instead of affecting the children within a container,
176 /// you can apply this property to a single child to change its alignment within its parent.<br/>
177 /// Alignment self overrides any option set by the parent with <see cref="ItemsAlignment"/>.
179 /// <param name="view">The child view.</param>
180 /// <param name="value">The value of alignment self.</param>
181 /// <since_tizen> 8 </since_tizen>
182 public static void SetFlexAlignmentSelf(View view, AlignmentType value)
184 SetChildValue(view, FlexAlignmentSelfProperty, value);
188 /// Sets the position type of the child view.<br/>
189 /// The position type of an element defines how it is positioned within its parent.
190 /// By default a child is positioned relatively. This means a child is positioned according to the normal flow of the layout,
191 /// and then offset relative to that position based on the values of <see cref="View.Margin"/>.<br/>
192 /// When positioned absolutely an element doesn't take part in the normal layout flow.
193 /// It is instead laid out independent of its siblings. The position is determined based on the <see cref="View.Margin"/>.
195 /// <param name="view">The child view.</param>
196 /// <param name="value">The value of position type.</param>
197 /// <since_tizen> 8 </since_tizen>
198 public static void SetFlexPositionType(View view, PositionType value)
200 SetChildValue(view, FlexPositionTypeProperty, value);
204 /// Sets the aspect ratio of the child view.
205 /// Aspect ratio Defines as the ratio between the width and the height of a node
206 /// e.g. if a node has an aspect ratio of 2 then its width is twice the size of its height.<br/>
207 /// Aspect ratio accepts any floating point value > 0. this has higher priority than flex grow.
209 /// <param name="view">The child view.</param>
210 /// <param name="value">The value of aspect ratio</param>
211 /// <since_tizen> 8 </since_tizen>
212 public static void SetFlexAspectRatio(View view, float value)
214 SetChildValue(view, FlexAspectRatioProperty, value);
218 /// Sets the flex basis of the child view.
219 /// Flex basis is an axis-independent way of providing the default size of an item along the main axis.<br/>
220 /// Setting the flex basis of a child is similar to setting the width of that child if its parent is a container with <see cref="FlexDirection.Row"/>
221 /// or setting the height of a child if its parent is a container with <see cref="FlexDirection.Column"/>.<br/>
222 /// The flex basis of an item is the default size of that item, the size of the item before any flex grow and flex shrink calculations are performed.
224 /// <param name="view">The child view.</param>
225 /// <param name="value">The value of basis</param>
226 /// <since_tizen> 8 </since_tizen>
227 public static void SetFlexBasis(View view, float value)
229 SetChildValue(view, FlexBasisProperty, value);
233 /// Sets the flex shrink of the child view.
234 /// Flex shrink describes how to shrink children along the main axis in the case that the total size of the children overflow the size of the container on the main axis.<br/>
235 /// Flex shrink is very similar to flex grow and can be thought of in the same way if any overflowing size is considered to be negative remaining space.
236 /// These two properties also work well together by allowing children to grow and shrink as needed.<br/>
237 /// Flex shrink accepts any floating point value >= 0, with 1 being the default value. A container will shrink its children weighted by the child’s flex shrink value.
239 /// <param name="view">The child view.</param>
240 /// <param name="value">The value of shrink</param>
241 /// <since_tizen> 8 </since_tizen>
242 public static void SetFlexShrink(View view, float value)
244 SetChildValue(view, FlexShrinkProperty, value);
248 /// Sets the grow of the child view.
249 /// Flex grow describes how any space within a container should be distributed among its children along the main axis.
250 /// After laying out its children, a container will distribute any remaining space according to the flex grow values specified by its children.<br/>
251 /// Flex grow accepts any floating point value >= 0, with 0 being the default value.<br/>
252 /// A container will distribute any remaining space among its children weighted by the child’s flex grow value.
254 /// <param name="view">The child view.</param>
255 /// <param name="value">The value of flex</param>
256 /// <since_tizen> 8 </since_tizen>
257 public static void SetFlexGrow(View view, float value)
259 SetChildValue(view, FlexGrowProperty, value);
262 [UnmanagedFunctionPointer(CallingConvention.StdCall)]
263 internal delegate MeasuredSize ChildMeasureCallback(global::System.IntPtr child, float width, int measureModeWidth, float height, int measureModeHeight);
265 event ChildMeasureCallback measureChildDelegate; // Stores a delegate to the child measure callback. Used for all children of this FlexLayout.
267 internal FlexLayout(global::System.IntPtr cPtr, bool cMemoryOwn)
269 swigCMemOwn = cMemoryOwn;
270 swigCPtr = new global::System.Runtime.InteropServices.HandleRef(this, cPtr);
271 _rootFlex = Interop.FlexLayout.FlexLayout_New();
272 measureChildDelegate = new ChildMeasureCallback(measureChild);
275 internal static global::System.Runtime.InteropServices.HandleRef getCPtr(FlexLayout obj)
277 return (obj == null) ? new global::System.Runtime.InteropServices.HandleRef(null, global::System.IntPtr.Zero) : obj.swigCPtr;
281 /// <since_tizen> 6 </since_tizen>
282 public void Dispose()
284 // Throw exception if Dispose() is called in separate thread.
285 if (!Window.IsInstalled())
287 throw new System.InvalidOperationException("This API called from separate thread. This API must be called from MainThread.");
292 Dispose(DisposeTypes.Implicit);
296 Dispose(DisposeTypes.Explicit);
297 System.GC.SuppressFinalize(this);
302 /// <since_tizen> 6 </since_tizen>
303 protected virtual void Dispose(DisposeTypes type)
310 if (type == DisposeTypes.Explicit)
313 // Release your own managed resources here.
314 // You should release all of your own disposable objects here.
318 // Release your own unmanaged resources here.
319 // You should not access any managed member here except static instance.
320 // because the execution order of Finalizes is non-deterministic.
321 if (swigCPtr.Handle != global::System.IntPtr.Zero)
326 Interop.FlexLayout.delete_FlexLayout(swigCPtr);
328 swigCPtr = new global::System.Runtime.InteropServices.HandleRef(null, global::System.IntPtr.Zero);
334 /// Creates a FlexLayout object.
336 /// <since_tizen> 6 </since_tizen>
337 public FlexLayout() : this(Interop.FlexLayout.FlexLayout_New(), true)
339 if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
342 internal static FlexLayout DownCast(BaseHandle handle)
344 FlexLayout ret = new FlexLayout(Interop.FlexLayout.FlexLayout_DownCast(BaseHandle.getCPtr(handle)), true);
345 if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
349 internal FlexLayout(FlexLayout other) : this(Interop.FlexLayout.new_FlexLayout__SWIG_1(FlexLayout.getCPtr(other)), true)
351 if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
354 internal FlexLayout Assign(FlexLayout other)
356 FlexLayout ret = new FlexLayout(Interop.FlexLayout.FlexLayout_Assign(swigCPtr, FlexLayout.getCPtr(other)), false);
357 if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
361 internal void SetFlexDirection(FlexLayout.FlexDirection flexDirection)
363 Interop.FlexLayout.FlexLayout_SetFlexDirection(swigCPtr, (int)flexDirection);
367 internal FlexLayout.FlexDirection GetFlexDirection()
369 FlexLayout.FlexDirection ret = (FlexLayout.FlexDirection)Interop.FlexLayout.FlexLayout_GetFlexDirection(swigCPtr);
374 internal void SetFlexJustification(FlexLayout.FlexJustification flexJustification)
376 Interop.FlexLayout.FlexLayout_SetFlexJustification(swigCPtr, (int)flexJustification);
380 internal FlexLayout.FlexJustification GetFlexJustification()
382 FlexLayout.FlexJustification ret = (FlexLayout.FlexJustification)Interop.FlexLayout.FlexLayout_GetFlexJustification(swigCPtr);
386 internal void SetFlexWrap(FlexLayout.FlexWrapType flexWrap)
388 Interop.FlexLayout.FlexLayout_SetFlexWrap(swigCPtr, (int)flexWrap);
392 internal FlexLayout.FlexWrapType GetFlexWrap()
394 FlexLayout.FlexWrapType ret = (FlexLayout.FlexWrapType)Interop.FlexLayout.FlexLayout_GetFlexWrap(swigCPtr);
398 internal void SetFlexAlignment(FlexLayout.AlignmentType flexAlignment)
400 Interop.FlexLayout.FlexLayout_SetFlexAlignment(swigCPtr, (int)flexAlignment);
404 internal FlexLayout.AlignmentType GetFlexAlignment()
406 FlexLayout.AlignmentType ret = (FlexLayout.AlignmentType)Interop.FlexLayout.FlexLayout_GetFlexAlignment(swigCPtr);
407 if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
411 internal void SetFlexItemsAlignment(FlexLayout.AlignmentType flexAlignment)
413 Interop.FlexLayout.FlexLayout_SetFlexItemsAlignment(swigCPtr, (int)flexAlignment);
417 internal FlexLayout.AlignmentType GetFlexItemsAlignment()
419 FlexLayout.AlignmentType ret = (FlexLayout.AlignmentType)Interop.FlexLayout.FlexLayout_GetFlexItemsAlignment(swigCPtr);
420 if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
425 /// Gets/Sets the flex direction in the layout.
426 /// The direction of the main-axis which determines the direction that flex items are laid out.
428 /// <since_tizen> 6 </since_tizen>
429 public FlexDirection Direction
433 return GetFlexDirection();
437 SetFlexDirection(value);
442 /// Gets/Sets the justification in the layout.
443 /// Justify content describes how to align children within the main axis of their container.<br/>
444 /// For example, you can use this property to center a child horizontally within a container with <see cref="Direction"/> set to <see cref="FlexDirection.Row"/>
445 /// or vertically within a container with <see cref="Direction"/> set to <see cref="FlexDirection.Column"/>.
447 /// <since_tizen> 6 </since_tizen>
448 public FlexJustification Justification
452 return GetFlexJustification();
456 SetFlexJustification(value);
461 /// Gets/Sets the wrap in the layout.
462 /// The flex wrap property is set on containers and controls what happens when children overflow the size of the container along the main axis.<br/>
463 /// By default children are forced into a single line (which can shrink elements).<br/>
464 /// If wrapping is allowed items are wrapped into multiple lines along the main axis if needed. wrap reverse behaves the same, but the order of the lines is reversed.<br/>
465 /// When wrapping lines <see cref="Alignment"/> can be used to specify how the lines are placed in the container.
467 /// <since_tizen> 6 </since_tizen>
468 public FlexWrapType WrapType
472 return GetFlexWrap();
481 /// Gets/Sets the alignment of the layout content.
482 /// Alignment defines the distribution of lines along the cross-axis.<br/>
483 /// This only has effect when items are wrapped to multiple lines using flex wrap.
485 /// <since_tizen> 6 </since_tizen>
486 public AlignmentType Alignment
490 return GetFlexAlignment();
494 SetFlexAlignment(value);
499 /// Gets/Sets the alignment of the layout items.
500 /// Items alignment describes how to align children along the cross axis of their container.<br/>
501 /// Align items is very similar to <see cref="Justification"/> but instead of applying to the main axis, align items applies to the cross axis.
503 /// <since_tizen> 6 </since_tizen>
504 public AlignmentType ItemsAlignment
508 return GetFlexItemsAlignment();
512 SetFlexItemsAlignment(value);
517 /// Enumeration for the direction of the main axis in the flex container.
518 /// This determines the direction that flex items are laid out in the flex container.
520 /// <since_tizen> 6 </since_tizen>
521 public enum FlexDirection
524 /// The flexible items are displayed vertically as a column
528 /// The flexible items are displayed vertically as a column, but in reverse order
532 /// The flexible items are displayed horizontally as a row
536 /// The flexible items are displayed horizontally as a row, but in reverse order
542 /// Enumeration for the alignment of the flex items when the items do not use all available space on the main-axis.
544 /// <since_tizen> 6 </since_tizen>
545 public enum FlexJustification
548 /// Items are positioned at the beginning of the container.
552 /// Items are positioned at the center of the container.
556 /// Items are positioned at the end of the container.
560 /// Items are positioned with equal space between the lines.
564 /// Items are positioned with equal space before, between, and after the lines.<br/>
565 /// Compared to <see cref="FlexJustification.SpaceBetween"/> using <see cref="FlexJustification.SpaceAround"/>
566 /// will result in space being distributed to the beginning of the first child and end of the last child.
572 /// Enumeration for the wrap type of the flex container when there is no enough room for all the items on one flex line.
574 /// <since_tizen> 6 </since_tizen>
575 public enum FlexWrapType
578 /// Flex items laid out in single line (shrunk to fit the flex container along the main axis)
582 /// Flex items laid out in multiple lines if needed
588 /// Enumeration for the alignment of the flex items or lines when the items or lines do not use all the available space on the cross-axis.
590 /// <since_tizen> 6 </since_tizen>
591 public enum AlignmentType
594 /// Inherits the same alignment from the parent
598 /// At the beginning of the container
602 /// At the center of the container
606 /// At the end of the container
610 /// Stretch to fit the container
616 /// Enumeration for the position type of the flex item how it is positioned within its parent.
618 /// <since_tizen> 8 </since_tizen>
619 public enum PositionType
622 /// Flex items laid out relatively.
626 /// Flex items laid out absolutely.
631 private MeasuredSize measureChild(global::System.IntPtr childPtr, float width, int measureModeWidth, float height, int measureModeHeight)
633 // We need to measure child layout
634 View child = Registry.GetManagedBaseHandleFromNativePtr(childPtr) as View;
636 LayoutItem childLayout = child.Layout;
638 MeasureSpecification childWidthMeasureSpec = GetChildMeasureSpecification(
639 new MeasureSpecification(
640 new LayoutLength(parentMeasureSpecificationWidth.Size - (child.Margin.Start + child.Margin.End)),
641 parentMeasureSpecificationWidth.Mode),
642 new LayoutLength(Padding.Start + Padding.End),
643 new LayoutLength(child.WidthSpecification));
645 MeasureSpecification childHeightMeasureSpec = GetChildMeasureSpecification(
646 new MeasureSpecification(
647 new LayoutLength(parentMeasureSpecificationHeight.Size - (child.Margin.Top + child.Margin.Bottom)),
648 parentMeasureSpecificationHeight.Mode),
649 new LayoutLength(Padding.Top + Padding.Bottom),
650 new LayoutLength(child.HeightSpecification));
652 childLayout.Measure(childWidthMeasureSpec, childHeightMeasureSpec);
654 return new MeasuredSize(childLayout.MeasuredWidth.Size.AsRoundedValue(), childLayout.MeasuredHeight.Size.AsRoundedValue());
657 void InsertChild(LayoutItem child)
659 // Store created node for child
660 IntPtr childPtr = Interop.FlexLayout.FlexLayout_AddChildWithMargin(swigCPtr, View.getCPtr(child.Owner), Extents.getCPtr(child.Owner.Margin), measureChildDelegate, LayoutChildren.Count - 1);
661 HandleRef childHandleRef = new HandleRef(child.Owner, childPtr);
662 SetChildValue(child.Owner, FlexItemProperty, childHandleRef);
666 /// Callback when child is added to container.<br />
667 /// Derived classes can use this to set their own child properties on the child layout's owner.<br />
669 /// <param name="child">The Layout child.</param>
670 /// <since_tizen> 6 </since_tizen>
671 protected override void OnChildAdd(LayoutItem child)
677 /// Callback when child is removed from container.<br />
679 /// <param name="child">The Layout child.</param>
680 /// <since_tizen> 6 </since_tizen>
681 protected override void OnChildRemove(LayoutItem child)
683 // When child View is removed from it's parent View (that is a Layout) then remove it from the layout too.
684 // FlexLayout refers to the child as a View not LayoutItem.
685 Interop.FlexLayout.FlexLayout_RemoveChild(swigCPtr, child);
689 /// Measure the layout and its content to determine the measured width and the measured height.<br />
691 /// <param name="widthMeasureSpec">horizontal space requirements as imposed by the parent.</param>
692 /// <param name="heightMeasureSpec">vertical space requirements as imposed by the parent.</param>
693 /// <since_tizen> 6 </since_tizen>
694 protected override void OnMeasure(MeasureSpecification widthMeasureSpec, MeasureSpecification heightMeasureSpec)
696 bool isLayoutRtl = Owner.LayoutDirection == ViewLayoutDirectionType.RTL;
697 Extents padding = Owner.Padding;
698 Extents margin = Owner.Margin;
700 Interop.FlexLayout.FlexLayout_SetMargin(swigCPtr, Extents.getCPtr(margin));
701 Interop.FlexLayout.FlexLayout_SetPadding(swigCPtr, Extents.getCPtr(padding));
703 float width = FlexUndefined; // Behaves as WrapContent (Flex Auto)
704 float height = FlexUndefined; // Behaves as WrapContent (Flex Auto)
706 if (widthMeasureSpec.Mode == MeasureSpecification.ModeType.Exactly || widthMeasureSpec.Mode == MeasureSpecification.ModeType.AtMost)
708 width = widthMeasureSpec.Size.AsDecimal();
711 if (heightMeasureSpec.Mode == MeasureSpecification.ModeType.Exactly || heightMeasureSpec.Mode == MeasureSpecification.ModeType.AtMost)
713 height = heightMeasureSpec.Size.AsDecimal();
716 // Save measureSpec to measure children.
717 // In other Layout, we can pass it as parameter to measuring child but in FlexLayout we can't
718 // because measurChild function is called by native callback.
719 parentMeasureSpecificationWidth = widthMeasureSpec;
720 parentMeasureSpecificationHeight = heightMeasureSpec;
722 // Assign child properties
723 for (int i = 0; i < LayoutChildren.Count; i++)
725 LayoutItem layoutItem = LayoutChildren[i];
726 View Child = layoutItem?.Owner;
727 HandleRef childHandleRef = (HandleRef)Child.GetValue(FlexItemProperty);
728 if (childHandleRef.Handle == IntPtr.Zero || Child == null)
731 AlignmentType flexAlignemnt = GetFlexAlignmentSelf(Child);
732 PositionType flexPosition = GetFlexPositionType(Child);
733 float flexAspectRatio = GetFlexAspectRatio(Child);
734 float flexBasis = GetFlexBasis(Child);
735 float flexShrink = GetFlexShrink(Child);
736 float flexGrow = GetFlexGrow(Child);
738 Interop.FlexLayout.FlexLayout_SetFlexAlignmentSelf(childHandleRef, (int)flexAlignemnt);
739 Interop.FlexLayout.FlexLayout_SetFlexPositionType(childHandleRef, (int)flexPosition);
740 Interop.FlexLayout.FlexLayout_SetFlexAspectRatio(childHandleRef, flexAspectRatio);
741 Interop.FlexLayout.FlexLayout_SetFlexBasis(childHandleRef, flexBasis);
742 Interop.FlexLayout.FlexLayout_SetFlexShrink(childHandleRef, flexShrink);
743 Interop.FlexLayout.FlexLayout_SetFlexGrow(childHandleRef, flexGrow);
746 Interop.FlexLayout.FlexLayout_CalculateLayout(swigCPtr, width, height, isLayoutRtl);
748 LayoutLength flexLayoutWidth = new LayoutLength(Interop.FlexLayout.FlexLayout_GetWidth(swigCPtr));
749 LayoutLength flexLayoutHeight = new LayoutLength(Interop.FlexLayout.FlexLayout_GetHeight(swigCPtr));
751 Debug.WriteLineIf(LayoutDebugFlex, "FlexLayout OnMeasure width:" + flexLayoutWidth.AsRoundedValue()
752 + " height:" + flexLayoutHeight.AsRoundedValue());
754 SetMeasuredDimensions(GetDefaultSize(flexLayoutWidth, widthMeasureSpec),
755 GetDefaultSize(flexLayoutHeight, heightMeasureSpec));
759 /// Assign a size and position to each of its children.<br />
761 /// <param name="changed">This is a new size or position for this layout.</param>
762 /// <param name="left">Left position, relative to parent.</param>
763 /// <param name="top"> Top position, relative to parent.</param>
764 /// <param name="right">Right position, relative to parent.</param>
765 /// <param name="bottom">Bottom position, relative to parent.</param>
766 /// <since_tizen> 6 </since_tizen>
767 protected override void OnLayout(bool changed, LayoutLength left, LayoutLength top, LayoutLength right, LayoutLength bottom)
770 bool isLayoutRtl = Owner.LayoutDirection == ViewLayoutDirectionType.RTL;
771 LayoutLength width = right - left;
772 LayoutLength height = bottom - top;
774 // Call to FlexLayout implementation to calculate layout values for later retrieval.
775 Interop.FlexLayout.FlexLayout_CalculateLayout(swigCPtr, width.AsDecimal(), height.AsDecimal(), isLayoutRtl);
777 int count = LayoutChildren.Count;
778 for (int childIndex = 0; childIndex < count; childIndex++)
780 LayoutItem childLayout = LayoutChildren[childIndex];
781 if (childLayout != null)
783 // Get the frame for the child, start, top, end, bottom.
784 Vector4 frame = new Vector4(Interop.FlexLayout.FlexLayout_GetNodeFrame(swigCPtr, childIndex), true);
785 childLayout.Layout(new LayoutLength(frame.X), new LayoutLength(frame.Y), new LayoutLength(frame.Z), new LayoutLength(frame.W));
791 } // namesspace Tizen.NUI