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, validateValue: ValidateEnum((int)AlignmentType.Auto, (int)AlignmentType.Stretch), propertyChanged: OnChildPropertyChanged);
47 /// FlexPositionTypeProperty
49 [EditorBrowsable(EditorBrowsableState.Never)]
50 public static readonly BindableProperty FlexPositionTypeProperty = BindableProperty.CreateAttached("FlexPositionType", typeof(PositionType), typeof(FlexLayout), PositionType.Relative, validateValue: ValidateEnum((int)PositionType.Relative, (int)PositionType.Absolute), 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) => GetAttachedValue<AlignmentType>(view, FlexAlignmentSelfProperty);
111 /// Gets the position type of the child view.
113 /// <seealso cref="SetFlexPositionType(View, PositionType)"/>
114 /// <param name="view">The child view.</param>
115 /// <returns> The value of position type</returns>
116 /// <since_tizen> 8 </since_tizen>
117 public static PositionType GetFlexPositionType(View view) => GetAttachedValue<PositionType>(view, FlexPositionTypeProperty);
120 /// Gets the aspect ratio of the child view.
122 /// <seealso cref="SetFlexAspectRatio(View, float)"/>
123 /// <param name="view">The child view.</param>
124 /// <returns> The value of aspect ratio</returns>
125 /// <since_tizen> 8 </since_tizen>
126 public static float GetFlexAspectRatio(View view) => GetAttachedValue<float>(view, FlexAspectRatioProperty);
129 /// Gets the basis of the child view.
131 /// <seealso cref="SetFlexBasis(View, float)"/>
132 /// <param name="view">The child view.</param>
133 /// <returns> The value of basis</returns>
134 /// <since_tizen> 8 </since_tizen>
135 public static float GetFlexBasis(View view) => GetAttachedValue<float>(view, FlexBasisProperty);
138 /// Gets the shrink of the child view.
140 /// <seealso cref="SetFlexShrink(View, float)"/>
141 /// <param name="view">The child view.</param>
142 /// <returns> The value of shrink</returns>
143 /// <since_tizen> 8 </since_tizen>
144 public static float GetFlexShrink(View view) => GetAttachedValue<float>(view, FlexShrinkProperty);
147 /// Gets the grow of the child view.
149 /// <seealso cref="SetFlexGrow(View, float)"/>
150 /// <param name="view">The child view.</param>
151 /// <returns> The value of grow</returns>
152 /// <since_tizen> 8 </since_tizen>
153 public static float GetFlexGrow(View view) => GetAttachedValue<float>(view, FlexGrowProperty);
156 /// Sets the alignment self of the child view.<br/>
157 /// Alignment self has the same options and effect as <see cref="ItemsAlignment"/> but instead of affecting the children within a container,
158 /// you can apply this property to a single child to change its alignment within its parent.<br/>
159 /// Alignment self overrides any option set by the parent with <see cref="ItemsAlignment"/>.
161 /// <param name="view">The child view.</param>
162 /// <param name="value">The value of alignment self.</param>
163 /// <since_tizen> 8 </since_tizen>
164 public static void SetFlexAlignmentSelf(View view, AlignmentType value) => SetAttachedValue(view, FlexAlignmentSelfProperty, value);
167 /// Sets the position type of the child view.<br/>
168 /// The position type of an element defines how it is positioned within its parent.
169 /// By default a child is positioned relatively. This means a child is positioned according to the normal flow of the layout,
170 /// and then offset relative to that position based on the values of <see cref="View.Margin"/>.<br/>
171 /// When positioned absolutely an element doesn't take part in the normal layout flow.
172 /// It is instead laid out independent of its siblings. The position is determined based on the <see cref="View.Margin"/>.
174 /// <param name="view">The child view.</param>
175 /// <param name="value">The value of position type.</param>
176 /// <since_tizen> 8 </since_tizen>
177 public static void SetFlexPositionType(View view, PositionType value) => SetAttachedValue(view, FlexPositionTypeProperty, value);
180 /// Sets the aspect ratio of the child view.
181 /// Aspect ratio Defines as the ratio between the width and the height of a node
182 /// e.g. if a node has an aspect ratio of 2 then its width is twice the size of its height.<br/>
183 /// Aspect ratio accepts any floating point value > 0. this has higher priority than flex grow.
185 /// <param name="view">The child view.</param>
186 /// <param name="value">The value of aspect ratio</param>
187 /// <since_tizen> 8 </since_tizen>
188 public static void SetFlexAspectRatio(View view, float value) => SetAttachedValue(view, FlexAspectRatioProperty, value);
191 /// Sets the flex basis of the child view.
192 /// Flex basis is an axis-independent way of providing the default size of an item along the main axis.<br/>
193 /// 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"/>
194 /// or setting the height of a child if its parent is a container with <see cref="FlexDirection.Column"/>.<br/>
195 /// 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.
197 /// <param name="view">The child view.</param>
198 /// <param name="value">The value of basis</param>
199 /// <since_tizen> 8 </since_tizen>
200 public static void SetFlexBasis(View view, float value) => SetAttachedValue(view, FlexBasisProperty, value);
203 /// Sets the flex shrink of the child view.
204 /// 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/>
205 /// 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.
206 /// These two properties also work well together by allowing children to grow and shrink as needed.<br/>
207 /// 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.
209 /// <param name="view">The child view.</param>
210 /// <param name="value">The value of shrink</param>
211 /// <since_tizen> 8 </since_tizen>
212 public static void SetFlexShrink(View view, float value) => SetAttachedValue(view, FlexShrinkProperty, value);
215 /// Sets the grow of the child view.
216 /// Flex grow describes how any space within a container should be distributed among its children along the main axis.
217 /// After laying out its children, a container will distribute any remaining space according to the flex grow values specified by its children.<br/>
218 /// Flex grow accepts any floating point value >= 0, with 0 being the default value.<br/>
219 /// A container will distribute any remaining space among its children weighted by the child’s flex grow value.
221 /// <param name="view">The child view.</param>
222 /// <param name="value">The value of flex</param>
223 /// <since_tizen> 8 </since_tizen>
224 public static void SetFlexGrow(View view, float value) => SetAttachedValue(view, FlexGrowProperty, value);
226 [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
227 internal delegate void ChildMeasureCallback( global::System.IntPtr child, float width, int measureModeWidth, float height, int measureModeHeight, out MeasuredSize measureSize );
229 event ChildMeasureCallback measureChildDelegate; // Stores a delegate to the child measure callback. Used for all children of this FlexLayout.
231 internal FlexLayout(global::System.IntPtr cPtr, bool cMemoryOwn)
233 swigCMemOwn = cMemoryOwn;
234 swigCPtr = new global::System.Runtime.InteropServices.HandleRef(this, cPtr);
235 _rootFlex = Interop.FlexLayout.FlexLayout_New();
236 measureChildDelegate = new ChildMeasureCallback(measureChild);
239 internal static global::System.Runtime.InteropServices.HandleRef getCPtr(FlexLayout obj)
241 return (obj == null) ? new global::System.Runtime.InteropServices.HandleRef(null, global::System.IntPtr.Zero) : obj.swigCPtr;
245 /// <since_tizen> 6 </since_tizen>
246 public void Dispose()
248 // Throw exception if Dispose() is called in separate thread.
249 if (!Window.IsInstalled())
251 throw new System.InvalidOperationException("This API called from separate thread. This API must be called from MainThread.");
256 Dispose(DisposeTypes.Implicit);
260 Dispose(DisposeTypes.Explicit);
261 System.GC.SuppressFinalize(this);
266 /// <since_tizen> 6 </since_tizen>
267 protected virtual void Dispose(DisposeTypes type)
274 if (type == DisposeTypes.Explicit)
277 // Release your own managed resources here.
278 // You should release all of your own disposable objects here.
282 // Release your own unmanaged resources here.
283 // You should not access any managed member here except static instance.
284 // because the execution order of Finalizes is non-deterministic.
285 if (swigCPtr.Handle != global::System.IntPtr.Zero)
290 Interop.FlexLayout.delete_FlexLayout(swigCPtr);
292 swigCPtr = new global::System.Runtime.InteropServices.HandleRef(null, global::System.IntPtr.Zero);
298 /// Creates a FlexLayout object.
300 /// <since_tizen> 6 </since_tizen>
301 public FlexLayout() : this(Interop.FlexLayout.FlexLayout_New(), true)
303 if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
306 internal static FlexLayout DownCast(BaseHandle handle)
308 FlexLayout ret = new FlexLayout(Interop.FlexLayout.FlexLayout_DownCast(BaseHandle.getCPtr(handle)), true);
309 if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
313 internal FlexLayout(FlexLayout other) : this(Interop.FlexLayout.new_FlexLayout__SWIG_1(FlexLayout.getCPtr(other)), true)
315 if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
318 internal FlexLayout.AlignmentType GetFlexAlignment()
320 FlexLayout.AlignmentType ret = (FlexLayout.AlignmentType)Interop.FlexLayout.FlexLayout_GetFlexAlignment(swigCPtr);
321 if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
325 internal FlexLayout.AlignmentType GetFlexItemsAlignment()
327 FlexLayout.AlignmentType ret = (FlexLayout.AlignmentType)Interop.FlexLayout.FlexLayout_GetFlexItemsAlignment(swigCPtr);
328 if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
333 /// Gets/Sets the flex direction in the layout.
334 /// The direction of the main-axis which determines the direction that flex items are laid out.
336 /// <exception cref="InvalidEnumArgumentException">Thrown when using invalid arguments that are enumerators.</exception>
337 /// <since_tizen> 6 </since_tizen>
338 public FlexDirection Direction
340 get => (FlexDirection)Interop.FlexLayout.FlexLayout_GetFlexDirection(swigCPtr);
343 if (value < FlexDirection.Column || value > FlexDirection.RowReverse)
344 throw new InvalidEnumArgumentException(nameof(Direction));
346 Interop.FlexLayout.FlexLayout_SetFlexDirection(swigCPtr, (int)value);
352 /// Gets/Sets the justification in the layout.
353 /// Justify content describes how to align children within the main axis of their container.<br/>
354 /// 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"/>
355 /// or vertically within a container with <see cref="Direction"/> set to <see cref="FlexDirection.Column"/>.
357 /// <exception cref="InvalidEnumArgumentException">Thrown when using invalid arguments that are enumerators.</exception>
358 /// <since_tizen> 6 </since_tizen>
359 public FlexJustification Justification
361 get => (FlexJustification)Interop.FlexLayout.FlexLayout_GetFlexJustification(swigCPtr);
364 if (value < FlexJustification.FlexStart || value > FlexJustification.SpaceAround)
365 throw new InvalidEnumArgumentException(nameof(Justification));
367 Interop.FlexLayout.FlexLayout_SetFlexJustification(swigCPtr, (int)value);
373 /// Gets/Sets the wrap in the layout.
374 /// 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/>
375 /// By default children are forced into a single line (which can shrink elements).<br/>
376 /// 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/>
377 /// When wrapping lines <see cref="Alignment"/> can be used to specify how the lines are placed in the container.
379 /// <exception cref="InvalidEnumArgumentException">Thrown when using invalid arguments that are enumerators.</exception>
380 /// <since_tizen> 6 </since_tizen>
381 public FlexWrapType WrapType
383 get => (FlexWrapType)Interop.FlexLayout.FlexLayout_GetFlexWrap(swigCPtr);
386 if (value != FlexWrapType.NoWrap || value != FlexWrapType.Wrap)
387 throw new InvalidEnumArgumentException(nameof(WrapType));
389 Interop.FlexLayout.FlexLayout_SetFlexWrap(swigCPtr, (int)value);
396 /// Gets/Sets the alignment of the layout content.
397 /// Alignment defines the distribution of lines along the cross-axis.<br/>
398 /// This only has effect when items are wrapped to multiple lines using flex wrap.
400 /// <exception cref="InvalidEnumArgumentException">Thrown when using invalid arguments that are enumerators.</exception>
401 /// <since_tizen> 6 </since_tizen>
402 public AlignmentType Alignment
404 get => GetFlexAlignment();
407 if (value < AlignmentType.Auto || value > AlignmentType.Stretch)
408 throw new InvalidEnumArgumentException(nameof(Alignment));
410 Interop.FlexLayout.FlexLayout_SetFlexAlignment(swigCPtr, (int)value);
416 /// Gets/Sets the alignment of the layout items.
417 /// Items alignment describes how to align children along the cross axis of their container.<br/>
418 /// Align items is very similar to <see cref="Justification"/> but instead of applying to the main axis, align items applies to the cross axis.
420 /// <exception cref="InvalidEnumArgumentException">Thrown when using invalid arguments that are enumerators.</exception>
421 /// <since_tizen> 6 </since_tizen>
422 public AlignmentType ItemsAlignment
424 get => GetFlexItemsAlignment();
427 if (value < AlignmentType.Auto || value > AlignmentType.Stretch)
428 throw new InvalidEnumArgumentException(nameof(ItemsAlignment));
430 Interop.FlexLayout.FlexLayout_SetFlexItemsAlignment(swigCPtr, (int)value);
436 /// Enumeration for the direction of the main axis in the flex container.
437 /// This determines the direction that flex items are laid out in the flex container.
439 /// <since_tizen> 6 </since_tizen>
440 public enum FlexDirection
443 /// The flexible items are displayed vertically as a column
447 /// The flexible items are displayed vertically as a column, but in reverse order
451 /// The flexible items are displayed horizontally as a row
455 /// The flexible items are displayed horizontally as a row, but in reverse order
461 /// Enumeration for the alignment of the flex items when the items do not use all available space on the main-axis.
463 /// <since_tizen> 6 </since_tizen>
464 public enum FlexJustification
467 /// Items are positioned at the beginning of the container.
471 /// Items are positioned at the center of the container.
475 /// Items are positioned at the end of the container.
479 /// Items are positioned with equal space between the lines.
483 /// Items are positioned with equal space before, between, and after the lines.<br/>
484 /// Compared to <see cref="FlexJustification.SpaceBetween"/> using <see cref="FlexJustification.SpaceAround"/>
485 /// will result in space being distributed to the beginning of the first child and end of the last child.
491 /// Enumeration for the wrap type of the flex container when there is no enough room for all the items on one flex line.
493 /// <since_tizen> 6 </since_tizen>
494 public enum FlexWrapType
497 /// Flex items laid out in single line (shrunk to fit the flex container along the main axis)
501 /// Flex items laid out in multiple lines if needed
507 /// 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.
509 /// <since_tizen> 6 </since_tizen>
510 public enum AlignmentType
513 /// Inherits the same alignment from the parent
517 /// At the beginning of the container
521 /// At the center of the container
525 /// At the end of the container
529 /// Stretch to fit the container
535 /// Enumeration for the position type of the flex item how it is positioned within its parent.
537 /// <since_tizen> 8 </since_tizen>
538 public enum PositionType
541 /// Flex items laid out relatively.
545 /// Flex items laid out absolutely.
550 private void measureChild(global::System.IntPtr childPtr, float width, int measureModeWidth, float height, int measureModeHeight, out MeasuredSize measureSize)
552 // We need to measure child layout
553 View child = Registry.GetManagedBaseHandleFromNativePtr(childPtr) as View;
555 LayoutItem childLayout = child.Layout;
557 MeasureSpecification childWidthMeasureSpec = GetChildMeasureSpecification(
558 new MeasureSpecification(
559 new LayoutLength(parentMeasureSpecificationWidth.Size - (child.Margin.Start + child.Margin.End)),
560 parentMeasureSpecificationWidth.Mode),
561 new LayoutLength(Padding.Start + Padding.End),
562 new LayoutLength(child.WidthSpecification));
564 MeasureSpecification childHeightMeasureSpec = GetChildMeasureSpecification(
565 new MeasureSpecification(
566 new LayoutLength(parentMeasureSpecificationHeight.Size - (child.Margin.Top + child.Margin.Bottom)),
567 parentMeasureSpecificationHeight.Mode),
568 new LayoutLength(Padding.Top + Padding.Bottom),
569 new LayoutLength(child.HeightSpecification));
571 childLayout.Measure(childWidthMeasureSpec, childHeightMeasureSpec);
573 measureSize.width = childLayout.MeasuredWidth.Size.AsRoundedValue();
574 measureSize.height = childLayout.MeasuredHeight.Size.AsRoundedValue();
577 void InsertChild(LayoutItem child)
579 // Store created node for child
580 IntPtr childPtr = Interop.FlexLayout.FlexLayout_AddChildWithMargin(swigCPtr, View.getCPtr(child.Owner), Extents.getCPtr(child.Owner.Margin), measureChildDelegate, LayoutChildren.Count - 1);
581 HandleRef childHandleRef = new HandleRef(child.Owner, childPtr);
582 SetAttachedValue(child.Owner, FlexItemProperty, childHandleRef);
586 /// Callback when child is added to container.<br />
587 /// Derived classes can use this to set their own child properties on the child layout's owner.<br />
589 /// <param name="child">The Layout child.</param>
590 /// <since_tizen> 6 </since_tizen>
591 protected override void OnChildAdd(LayoutItem child)
597 /// Callback when child is removed from container.<br />
599 /// <param name="child">The Layout child.</param>
600 /// <since_tizen> 6 </since_tizen>
601 protected override void OnChildRemove(LayoutItem child)
603 // When child View is removed from it's parent View (that is a Layout) then remove it from the layout too.
604 // FlexLayout refers to the child as a View not LayoutItem.
605 Interop.FlexLayout.FlexLayout_RemoveChild(swigCPtr, child);
609 /// Measure the layout and its content to determine the measured width and the measured height.<br />
611 /// <param name="widthMeasureSpec">horizontal space requirements as imposed by the parent.</param>
612 /// <param name="heightMeasureSpec">vertical space requirements as imposed by the parent.</param>
613 /// <since_tizen> 6 </since_tizen>
614 protected override void OnMeasure(MeasureSpecification widthMeasureSpec, MeasureSpecification heightMeasureSpec)
616 bool isLayoutRtl = Owner.LayoutDirection == ViewLayoutDirectionType.RTL;
617 Extents padding = Owner.Padding;
618 Extents margin = Owner.Margin;
620 Interop.FlexLayout.FlexLayout_SetMargin(swigCPtr, Extents.getCPtr(margin));
621 Interop.FlexLayout.FlexLayout_SetPadding(swigCPtr, Extents.getCPtr(padding));
623 float width = FlexUndefined; // Behaves as WrapContent (Flex Auto)
624 float height = FlexUndefined; // Behaves as WrapContent (Flex Auto)
626 if (widthMeasureSpec.Mode == MeasureSpecification.ModeType.Exactly || widthMeasureSpec.Mode == MeasureSpecification.ModeType.AtMost)
628 width = widthMeasureSpec.Size.AsDecimal();
631 if (heightMeasureSpec.Mode == MeasureSpecification.ModeType.Exactly || heightMeasureSpec.Mode == MeasureSpecification.ModeType.AtMost)
633 height = heightMeasureSpec.Size.AsDecimal();
636 // Save measureSpec to measure children.
637 // In other Layout, we can pass it as parameter to measuring child but in FlexLayout we can't
638 // because measurChild function is called by native callback.
639 parentMeasureSpecificationWidth = widthMeasureSpec;
640 parentMeasureSpecificationHeight = heightMeasureSpec;
642 // Assign child properties
643 for (int i = 0; i < LayoutChildren.Count; i++)
645 LayoutItem layoutItem = LayoutChildren[i];
646 View Child = layoutItem?.Owner;
647 HandleRef childHandleRef = (HandleRef)Child.GetValue(FlexItemProperty);
648 if (childHandleRef.Handle == IntPtr.Zero || Child == null)
651 AlignmentType flexAlignemnt = GetFlexAlignmentSelf(Child);
652 PositionType flexPosition = GetFlexPositionType(Child);
653 float flexAspectRatio = GetFlexAspectRatio(Child);
654 float flexBasis = GetFlexBasis(Child);
655 float flexShrink = GetFlexShrink(Child);
656 float flexGrow = GetFlexGrow(Child);
658 Interop.FlexLayout.FlexLayout_SetFlexAlignmentSelf(childHandleRef, (int)flexAlignemnt);
659 Interop.FlexLayout.FlexLayout_SetFlexPositionType(childHandleRef, (int)flexPosition);
660 Interop.FlexLayout.FlexLayout_SetFlexAspectRatio(childHandleRef, flexAspectRatio);
661 Interop.FlexLayout.FlexLayout_SetFlexBasis(childHandleRef, flexBasis);
662 Interop.FlexLayout.FlexLayout_SetFlexShrink(childHandleRef, flexShrink);
663 Interop.FlexLayout.FlexLayout_SetFlexGrow(childHandleRef, flexGrow);
666 Interop.FlexLayout.FlexLayout_CalculateLayout(swigCPtr, width, height, isLayoutRtl);
668 LayoutLength flexLayoutWidth = new LayoutLength(Interop.FlexLayout.FlexLayout_GetWidth(swigCPtr));
669 LayoutLength flexLayoutHeight = new LayoutLength(Interop.FlexLayout.FlexLayout_GetHeight(swigCPtr));
671 Debug.WriteLineIf(LayoutDebugFlex, "FlexLayout OnMeasure width:" + flexLayoutWidth.AsRoundedValue()
672 + " height:" + flexLayoutHeight.AsRoundedValue());
674 SetMeasuredDimensions(GetDefaultSize(flexLayoutWidth, widthMeasureSpec),
675 GetDefaultSize(flexLayoutHeight, heightMeasureSpec));
679 /// Assign a size and position to each of its children.<br />
681 /// <param name="changed">This is a new size or position for this layout.</param>
682 /// <param name="left">Left position, relative to parent.</param>
683 /// <param name="top"> Top position, relative to parent.</param>
684 /// <param name="right">Right position, relative to parent.</param>
685 /// <param name="bottom">Bottom position, relative to parent.</param>
686 /// <since_tizen> 6 </since_tizen>
687 protected override void OnLayout(bool changed, LayoutLength left, LayoutLength top, LayoutLength right, LayoutLength bottom)
690 bool isLayoutRtl = Owner.LayoutDirection == ViewLayoutDirectionType.RTL;
691 LayoutLength width = right - left;
692 LayoutLength height = bottom - top;
694 // Call to FlexLayout implementation to calculate layout values for later retrieval.
695 Interop.FlexLayout.FlexLayout_CalculateLayout(swigCPtr, width.AsDecimal(), height.AsDecimal(), isLayoutRtl);
697 int count = LayoutChildren.Count;
698 for (int childIndex = 0; childIndex < count; childIndex++)
700 LayoutItem childLayout = LayoutChildren[childIndex];
701 if (childLayout != null)
703 // Get the frame for the child, start, top, end, bottom.
704 Vector4 frame = new Vector4(Interop.FlexLayout.FlexLayout_GetNodeFrame(swigCPtr, childIndex), true);
705 childLayout.Layout(new LayoutLength(frame.X), new LayoutLength(frame.Y), new LayoutLength(frame.Z), new LayoutLength(frame.W));
711 } // namesspace Tizen.NUI