2 * Copyright (c) 2014 Samsung Electronics Co., Ltd.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
20 #include <dali-toolkit/public-api/controls/scrollable/item-view/grid-layout.h>
23 using namespace Dali::Toolkit;
26 namespace // unnamed namespace
29 const unsigned int DEFAULT_NUMBER_OF_COLUMNS = 4;
30 const float DEFAULT_TOP_MARGIN = 95.0f;
31 const float DEFAULT_BOTTOM_MARGIN = 20.0f;
32 const float DEFAULT_SIDE_MARGIN = 20.0f;
33 const float DEFAULT_COLUMN_SPACING = 20.0f;
34 const float DEFAULT_ROW_SPACING = 20.0f;
35 const float DEFAULT_SCROLL_SPEED_FACTOR = 0.03f;
36 const float DEFAULT_MAXIMUM_SWIPE_SPEED = 100.0f;
37 const float DEFAULT_ITEM_FLICK_ANIMATION_DURATION = 0.015f;
39 // 4 orientations are supported
40 static const unsigned int ORIENTATION_COUNT = 4;
42 static Vector3 GetItemSizeDefaultFunction(unsigned int numberOfColumns, float layoutWidth, float sideMargin, float columnSpacing)
44 float width = (layoutWidth - sideMargin * 2.0f - columnSpacing * static_cast<float>(numberOfColumns - 1)) / static_cast<float>(numberOfColumns);
47 return Vector3(width, width * 0.75f, width * 0.75f);
50 struct GridPositionConstraint0
52 GridPositionConstraint0(const unsigned int columnIndex, const unsigned int numberOfColumns, const float rowSpacing, const float columnSpacing, const float topMargin, const float sideMargin, GridLayout::ItemSizeFunction itemSizeFunction, const float gap)
53 : mColumnIndex(columnIndex),
54 mNumberOfColumns(numberOfColumns),
55 mRowSpacing(rowSpacing),
56 mColumnSpacing(columnSpacing),
57 mTopMargin(topMargin),
58 mSideMargin(sideMargin),
59 mItemSizeFunction(itemSizeFunction),
64 Vector3 operator()(const Vector3& current, const float& layoutPosition, const float& scrollSpeed, const Vector3& layoutSize)
66 Vector3 itemSize = mItemSizeFunction(mNumberOfColumns, layoutSize.width, mSideMargin, mColumnSpacing);
68 return Vector3(mSideMargin + (mColumnIndex * (itemSize.x + mColumnSpacing)) + itemSize.x * 0.5f - layoutSize.x * 0.5f,
69 ((itemSize.y + mRowSpacing) * (layoutPosition - mColumnIndex)) / mNumberOfColumns - layoutSize.height * 0.5f + itemSize.y * 0.5f + mTopMargin,
70 mColumnIndex * mZGap);
75 unsigned int mColumnIndex;
76 unsigned int mNumberOfColumns;
81 GridLayout::ItemSizeFunction mItemSizeFunction;
85 struct GridPositionConstraint90
87 GridPositionConstraint90(const unsigned int columnIndex, const unsigned int numberOfColumns, const float rowSpacing, const float columnSpacing, const float topMargin, const float sideMargin, GridLayout::ItemSizeFunction itemSizeFunction, const float gap)
88 : mColumnIndex(columnIndex),
89 mNumberOfColumns(numberOfColumns),
90 mRowSpacing(rowSpacing),
91 mColumnSpacing(columnSpacing),
92 mTopMargin(topMargin),
93 mSideMargin(sideMargin),
94 mItemSizeFunction(itemSizeFunction),
99 Vector3 operator()(const Vector3& current, const float& layoutPosition, const float& scrollSpeed, const Vector3& layoutSize)
101 Vector3 itemSize = mItemSizeFunction(mNumberOfColumns, layoutSize.height, mSideMargin, mColumnSpacing);
103 return Vector3(((itemSize.y + mRowSpacing) * (layoutPosition - mColumnIndex)) / mNumberOfColumns - layoutSize.width * 0.5f + itemSize.y * 0.5f + mTopMargin,
104 -(mSideMargin + (mColumnIndex * (itemSize.x + mColumnSpacing)) + itemSize.x * 0.5f - layoutSize.y*0.5f),
105 mColumnIndex * mZGap);
110 unsigned int mColumnIndex;
111 unsigned int mNumberOfColumns;
113 float mColumnSpacing;
116 GridLayout::ItemSizeFunction mItemSizeFunction;
120 struct GridPositionConstraint180
122 GridPositionConstraint180(const unsigned int columnIndex, const unsigned int numberOfColumns, const float rowSpacing, const float columnSpacing, const float topMargin, const float sideMargin, GridLayout::ItemSizeFunction itemSizeFunction, const float gap)
123 : mColumnIndex(columnIndex),
124 mNumberOfColumns(numberOfColumns),
125 mRowSpacing(rowSpacing),
126 mColumnSpacing(columnSpacing),
127 mTopMargin(topMargin),
128 mSideMargin(sideMargin),
129 mItemSizeFunction(itemSizeFunction),
134 Vector3 operator()(const Vector3& current, const float& layoutPosition, const float& scrollSpeed, const Vector3& layoutSize)
136 Vector3 itemSize = mItemSizeFunction(mNumberOfColumns, layoutSize.width, mSideMargin, mColumnSpacing);
138 return Vector3(-(mSideMargin + (mColumnIndex * (itemSize.x + mColumnSpacing)) + itemSize.x * 0.5f - layoutSize.x * 0.5f),
139 -(((itemSize.y + mRowSpacing) * (layoutPosition - mColumnIndex)) / mNumberOfColumns - layoutSize.height * 0.5f + itemSize.y * 0.5f + mTopMargin),
140 mColumnIndex * mZGap);
145 unsigned int mColumnIndex;
146 unsigned int mNumberOfColumns;
148 float mColumnSpacing;
151 GridLayout::ItemSizeFunction mItemSizeFunction;
155 struct GridPositionConstraint270
157 GridPositionConstraint270(const unsigned int columnIndex, const unsigned int numberOfColumns, const float rowSpacing, const float columnSpacing, const float topMargin, const float sideMargin, GridLayout::ItemSizeFunction itemSizeFunction, const float gap)
158 : mColumnIndex(columnIndex),
159 mNumberOfColumns(numberOfColumns),
160 mRowSpacing(rowSpacing),
161 mColumnSpacing(columnSpacing),
162 mTopMargin(topMargin),
163 mSideMargin(sideMargin),
164 mItemSizeFunction(itemSizeFunction),
169 Vector3 operator()(const Vector3& current, const float& layoutPosition, const float& scrollSpeed, const Vector3& layoutSize)
171 Vector3 itemSize = mItemSizeFunction(mNumberOfColumns, layoutSize.height, mSideMargin, mColumnSpacing);
173 return Vector3(-(((itemSize.y + mRowSpacing) * (layoutPosition - mColumnIndex)) / mNumberOfColumns - layoutSize.width * 0.5f + itemSize.y * 0.5f + mTopMargin),
174 mSideMargin + (mColumnIndex * (itemSize.x + mColumnSpacing)) + itemSize.x * 0.5f - layoutSize.y * 0.5f,
175 mColumnIndex * mZGap);
180 unsigned int mColumnIndex;
181 unsigned int mNumberOfColumns;
183 float mColumnSpacing;
186 GridLayout::ItemSizeFunction mItemSizeFunction;
190 struct GridRotationConstraint0
192 Quaternion operator()(const Quaternion& current, const float& layoutPosition, const float& scrollSpeed, const Vector3& layoutSize)
194 return Quaternion(0.0f, Vector3::ZAXIS);
198 struct GridRotationConstraint90
200 Quaternion operator()(const Quaternion& current, const float& layoutPosition, const float& scrollSpeed, const Vector3& layoutSize)
202 return Quaternion(1.5f * Math::PI, Vector3::ZAXIS);
206 struct GridRotationConstraint180
208 Quaternion operator()(const Quaternion& current, const float& layoutPosition, const float& scrollSpeed, const Vector3& layoutSize)
210 return Quaternion(Math::PI, Vector3::ZAXIS);
214 struct GridRotationConstraint270
216 Quaternion operator()(const Quaternion& current, const float& layoutPosition, const float& scrollSpeed, const Vector3& layoutSize)
218 return Quaternion(0.5f * Math::PI, Vector3::ZAXIS);
222 struct GridColorConstraint
224 Vector4 operator()(const Vector4& current, const float& layoutPosition, const float& scrollSpeed, const Vector3& layoutSize)
226 return Vector4( 1.0f, 1.0f, 1.0f, current.a );
230 struct GridVisibilityConstraintPortrait
232 GridVisibilityConstraintPortrait(const unsigned int columnIndex, const unsigned int numberOfColumns, const float rowSpacing, const float columnSpacing, const float sideMargin, GridLayout::ItemSizeFunction itemSizeFunction)
233 : mColumnIndex(columnIndex),
234 mNumberOfColumns(numberOfColumns),
235 mRowSpacing(rowSpacing),
236 mColumnSpacing(columnSpacing),
237 mSideMargin(sideMargin),
238 mItemSizeFunction(itemSizeFunction)
242 bool operator()(const bool& current, const float& layoutPosition, const float& scrollSpeed, const Vector3& layoutSize)
244 Vector3 itemSize = mItemSizeFunction(mNumberOfColumns, layoutSize.width, mSideMargin, mColumnSpacing);
246 float row = (layoutPosition - static_cast<float>(mColumnIndex)) / mNumberOfColumns;
247 int rowsPerPage = ceil(layoutSize.height / (itemSize.y + mRowSpacing));
249 return (row > -2.0f) && (row < rowsPerPage);
254 unsigned int mColumnIndex;
255 unsigned int mNumberOfColumns;
257 float mColumnSpacing;
259 GridLayout::ItemSizeFunction mItemSizeFunction;
262 struct GridVisibilityConstraintLandscape
264 GridVisibilityConstraintLandscape(const unsigned int columnIndex, const unsigned int numberOfColumns, const float rowSpacing, const float columnSpacing, const float sideMargin, GridLayout::ItemSizeFunction itemSizeFunction)
265 : mColumnIndex(columnIndex),
266 mNumberOfColumns(numberOfColumns),
267 mRowSpacing(rowSpacing),
268 mColumnSpacing(columnSpacing),
269 mSideMargin(sideMargin),
270 mItemSizeFunction(itemSizeFunction)
274 bool operator()(const bool& current, const float& layoutPosition, const float& scrollSpeed, const Vector3& layoutSize)
276 Vector3 itemSize = mItemSizeFunction(mNumberOfColumns, layoutSize.height, mSideMargin, mColumnSpacing);
278 float row = (layoutPosition - static_cast<float>(mColumnIndex)) / mNumberOfColumns;
279 int rowsPerPage = ceil(layoutSize.width / (itemSize.y + mRowSpacing));
281 return (row > -2.0f) && (row < rowsPerPage);
286 unsigned int mColumnIndex;
287 unsigned int mNumberOfColumns;
289 float mColumnSpacing;
291 GridLayout::ItemSizeFunction mItemSizeFunction;
294 } // unnamed namespace
302 struct GridLayout::Impl
305 : mNumberOfColumns(DEFAULT_NUMBER_OF_COLUMNS),
306 mRowSpacing(DEFAULT_ROW_SPACING),
307 mColumnSpacing(DEFAULT_COLUMN_SPACING),
308 mTopMargin(DEFAULT_TOP_MARGIN),
309 mBottomMargin(DEFAULT_BOTTOM_MARGIN),
310 mSideMargin(DEFAULT_SIDE_MARGIN),
311 mScrollSpeedFactor(DEFAULT_SCROLL_SPEED_FACTOR),
312 mMaximumSwipeSpeed(DEFAULT_MAXIMUM_SWIPE_SPEED),
313 mItemFlickAnimationDuration(DEFAULT_ITEM_FLICK_ANIMATION_DURATION),
314 mItemSizeFunction(GetItemSizeDefaultFunction)
316 mColorConstraint = GridColorConstraint();
318 mRotationConstraint[0] = GridRotationConstraint0();
319 mRotationConstraint[1] = GridRotationConstraint90();
320 mRotationConstraint[2] = GridRotationConstraint180();
321 mRotationConstraint[3] = GridRotationConstraint270();
324 unsigned int mNumberOfColumns;
326 float mColumnSpacing;
332 float mScrollSpeedFactor;
333 float mMaximumSwipeSpeed;
334 float mItemFlickAnimationDuration;
336 ItemLayout::QuaternionFunction mRotationConstraint[ORIENTATION_COUNT];
337 ItemLayout::Vector4Function mColorConstraint;
339 ItemSizeFunction mItemSizeFunction;
342 GridLayoutPtr GridLayout::New()
344 return GridLayoutPtr(new GridLayout());
347 GridLayout::~GridLayout()
352 void GridLayout::SetNumberOfColumns(unsigned int columns)
354 mImpl->mNumberOfColumns = columns;
357 unsigned int GridLayout::GetNumberOfColumns() const
359 return mImpl->mNumberOfColumns;
362 void GridLayout::SetRowSpacing(float spacing)
364 mImpl->mRowSpacing = spacing;
367 float GridLayout::GetRowSpacing() const
369 return mImpl->mRowSpacing;
372 void GridLayout::SetColumnSpacing(float spacing)
374 mImpl->mColumnSpacing = spacing;
377 float GridLayout::GetColumnSpacing() const
379 return mImpl->mColumnSpacing;
382 void GridLayout::SetTopMargin(float margin)
384 mImpl->mTopMargin = margin;
387 float GridLayout::GetTopMargin() const
389 return mImpl->mTopMargin;
392 void GridLayout::SetBottomMargin(float margin)
394 mImpl->mBottomMargin = margin;
397 float GridLayout::GetBottomMargin() const
399 return mImpl->mBottomMargin;
402 void GridLayout::SetSideMargin(float margin)
404 mImpl->mSideMargin = margin;
407 float GridLayout::GetSideMargin() const
409 return mImpl->mSideMargin;
412 void GridLayout::SetZGap(float gap)
417 float GridLayout::GetZGap() const
422 void GridLayout::SetItemSizeFunction(ItemSizeFunction function)
424 mImpl->mItemSizeFunction = function;
427 GridLayout::ItemSizeFunction GridLayout::GetItemSizeFunction() const
429 return mImpl->mItemSizeFunction;
432 void GridLayout::SetScrollSpeedFactor(float scrollSpeed)
434 mImpl->mScrollSpeedFactor = scrollSpeed;
437 void GridLayout::SetMaximumSwipeSpeed(float speed)
439 mImpl->mMaximumSwipeSpeed = speed;
442 void GridLayout::SetItemFlickAnimationDuration(float durationSeconds)
444 mImpl->mItemFlickAnimationDuration = durationSeconds;
447 float GridLayout::GetScrollSpeedFactor() const
449 return mImpl->mScrollSpeedFactor;
452 float GridLayout::GetMaximumSwipeSpeed() const
454 return mImpl->mMaximumSwipeSpeed;
457 float GridLayout::GetItemFlickAnimationDuration() const
459 return mImpl->mItemFlickAnimationDuration;
462 float GridLayout::GetMinimumLayoutPosition(unsigned int numberOfItems, Vector3 layoutSize) const
464 float layoutWidth = IsHorizontal(mOrientation) ? layoutSize.height : layoutSize.width;
465 float layoutHeight = IsHorizontal(mOrientation) ? layoutSize.width : layoutSize.height;
467 Vector3 itemSize = mImpl->mItemSizeFunction( mImpl->mNumberOfColumns, layoutWidth, mImpl->mSideMargin, mImpl->mColumnSpacing);
469 unsigned int itemsLastRow = numberOfItems % mImpl->mNumberOfColumns;
470 if (itemsLastRow == 0)
472 itemsLastRow = mImpl->mNumberOfColumns;
475 float rowsLastPage = (layoutHeight - mImpl->mBottomMargin - mImpl->mTopMargin + mImpl->mRowSpacing) / (itemSize.y + mImpl->mRowSpacing);
476 float itemsLastPage = (rowsLastPage - 1.0f) * static_cast<float>(mImpl->mNumberOfColumns) + static_cast<float>(itemsLastRow);
478 return itemsLastPage - static_cast<float>(numberOfItems);
481 float GridLayout::GetClosestAnchorPosition(float layoutPosition) const
483 float rowIndex = static_cast<float>(round(layoutPosition / mImpl->mNumberOfColumns));
484 return rowIndex * static_cast<float>(mImpl->mNumberOfColumns);
487 float GridLayout::GetItemScrollToPosition(unsigned int itemId) const
489 float rowIndex = static_cast<float>(itemId / mImpl->mNumberOfColumns);
490 return -rowIndex * static_cast<float>(mImpl->mNumberOfColumns);
493 ItemRange GridLayout::GetItemsWithinArea(float firstItemPosition, Vector3 layoutSize) const
495 float layoutWidth = IsHorizontal(mOrientation) ? layoutSize.height : layoutSize.width;
496 float layoutHeight = IsHorizontal(mOrientation) ? layoutSize.width : layoutSize.height;
498 Vector3 itemSize = mImpl->mItemSizeFunction( mImpl->mNumberOfColumns, layoutWidth, mImpl->mSideMargin, mImpl->mColumnSpacing);
500 int itemsPerPage = mImpl->mNumberOfColumns * ceil(layoutHeight / (itemSize.y + mImpl->mRowSpacing));
501 int firstVisibleItem = -(static_cast<int>(firstItemPosition / mImpl->mNumberOfColumns)) * mImpl->mNumberOfColumns;
503 int firstItemIndex = std::max(0, firstVisibleItem - static_cast<int>(mImpl->mNumberOfColumns));
504 int lastItemIndex = std::max(0, firstVisibleItem + itemsPerPage);
506 return ItemRange(firstItemIndex, lastItemIndex);
509 float GridLayout::GetClosestOnScreenLayoutPosition(int itemID, float currentLayoutPosition, const Vector3& layoutSize)
511 ItemLayout::Vector3Function positionConstraint;
512 Vector3 itemPosition = Vector3::ZERO;
513 if (GetPositionConstraint(itemID, positionConstraint))
515 itemPosition = positionConstraint(Vector3::ZERO, currentLayoutPosition + itemID, 0.0f, layoutSize);
518 GetItemSize(itemID, layoutSize, itemSize);
519 Vector3 onScreenArea = (layoutSize - (IsVertical(mOrientation) ? itemSize : Vector3(itemSize.y, itemSize.x, itemSize.z))) * 0.5f;
520 if (itemPosition.x < -onScreenArea.x
521 || itemPosition.x > onScreenArea.x
522 || itemPosition.y < -onScreenArea.y
523 || itemPosition.y > onScreenArea.y)
525 // item not within viewable area
526 float rowHeight = itemSize.y + mImpl->mRowSpacing;
527 ItemLayout::Vector3Function firstItemPositionConstraint;
528 Vector3 firstItemPosition = Vector3::ZERO;
530 if (GetPositionConstraint(0, firstItemPositionConstraint))
532 firstItemPosition = firstItemPositionConstraint(Vector3::ZERO, 0.0f, 0.0f, layoutSize);
534 switch( mOrientation )
536 case ControlOrientation::Up:
538 if(itemPosition.y > onScreenArea.y)
540 offset = ((layoutSize.y - rowHeight) * 0.5f) - firstItemPosition.y;
544 offset = ((-layoutSize.y + rowHeight) * 0.5f) - firstItemPosition.y;
548 case ControlOrientation::Down:
550 if(itemPosition.y < -onScreenArea.y)
552 offset = ((layoutSize.y - rowHeight) * 0.5f) - firstItemPosition.y;
556 offset = ((-layoutSize.y + rowHeight) * 0.5f) - firstItemPosition.y;
560 case ControlOrientation::Left:
562 if(itemPosition.x > onScreenArea.x)
564 offset = ((layoutSize.x - rowHeight) * 0.5f) - firstItemPosition.x;
568 offset = ((-layoutSize.x + rowHeight) * 0.5f) - firstItemPosition.x;
572 case ControlOrientation::Right:
574 if(itemPosition.x < -onScreenArea.x)
576 offset = ((layoutSize.x - rowHeight) * 0.5f) - firstItemPosition.x;
580 offset = ((-layoutSize.x + rowHeight) * 0.5f) - firstItemPosition.x;
585 // work out number of rows from first item position to an item aligned to bottom of screen
586 float rowDiff = offset / rowHeight;
587 float layoutPositionOffset = rowDiff * mImpl->mNumberOfColumns;
588 float scrollTo = GetItemScrollToPosition(itemID) + layoutPositionOffset;
591 return currentLayoutPosition;
594 unsigned int GridLayout::GetReserveItemCount(Vector3 layoutSize) const
596 float layoutWidth = IsHorizontal(mOrientation) ? layoutSize.height : layoutSize.width;
597 float layoutHeight = IsHorizontal(mOrientation) ? layoutSize.width : layoutSize.height;
599 Vector3 itemSize = mImpl->mItemSizeFunction( mImpl->mNumberOfColumns, layoutWidth, mImpl->mSideMargin, mImpl->mColumnSpacing);
600 int itemsPerPage = mImpl->mNumberOfColumns * ceil(layoutHeight / (itemSize.y + mImpl->mRowSpacing));
604 bool GridLayout::GetItemSize(unsigned int itemId, Vector3 layoutSize, Vector3& itemSize) const
606 // Note: itemId is not checked, since every item has the same size
608 itemSize = mImpl->mItemSizeFunction( mImpl->mNumberOfColumns, (IsHorizontal(mOrientation) ? layoutSize.height : layoutSize.width), mImpl->mSideMargin, mImpl->mColumnSpacing);
612 void GridLayout::GetResizeAnimation(Animation& animation, Actor actor, Vector3 size, float durationSeconds) const
616 Vector3 currentSize( actor.GetCurrentSize() );
617 Vector3 shrink( currentSize );
619 shrink.width = min(size.width, currentSize.width);
620 shrink.height = min(size.height, currentSize.height);
622 // Do a nonlinear size animation to shrink the actor first when the actor size changes,
623 // so that we can avoid the actors overlapping during orientation change.
624 animation.Resize( actor, shrink, AlphaFunctions::EaseOut, 0.0f, durationSeconds * 0.5f );
625 animation.Resize( actor, size, AlphaFunctions::EaseIn, 0.0f, durationSeconds );
629 bool GridLayout::GetPositionConstraint(unsigned int itemId, ItemLayout::Vector3Function& constraint) const
631 unsigned int columnIndex = itemId % mImpl->mNumberOfColumns;
633 if (mOrientation == ControlOrientation::Up)
635 constraint = GridPositionConstraint0(columnIndex, mImpl->mNumberOfColumns, mImpl->mRowSpacing, mImpl->mColumnSpacing, mImpl->mTopMargin, mImpl->mSideMargin, mImpl->mItemSizeFunction, mImpl->mZGap);
637 else if (mOrientation == ControlOrientation::Left)
639 constraint = GridPositionConstraint90(columnIndex, mImpl->mNumberOfColumns, mImpl->mRowSpacing, mImpl->mColumnSpacing, mImpl->mTopMargin, mImpl->mSideMargin, mImpl->mItemSizeFunction, mImpl->mZGap);
641 else if (mOrientation == ControlOrientation::Down)
643 constraint = GridPositionConstraint180(columnIndex, mImpl->mNumberOfColumns, mImpl->mRowSpacing, mImpl->mColumnSpacing, mImpl->mTopMargin, mImpl->mSideMargin, mImpl->mItemSizeFunction, mImpl->mZGap);
645 else // mOrientation == ControlOrientation::Right
647 constraint = GridPositionConstraint270(columnIndex, mImpl->mNumberOfColumns, mImpl->mRowSpacing, mImpl->mColumnSpacing, mImpl->mTopMargin, mImpl->mSideMargin, mImpl->mItemSizeFunction, mImpl->mZGap);
653 bool GridLayout::GetRotationConstraint(unsigned int itemId, ItemLayout::QuaternionFunction& constraint) const
655 constraint = mImpl->mRotationConstraint[mOrientation];
659 bool GridLayout::GetScaleConstraint(unsigned int itemId, ItemLayout::Vector3Function& constraint) const
661 return false; // No scaling
664 bool GridLayout::GetColorConstraint(unsigned int itemId, ItemLayout::Vector4Function& constraint) const
666 constraint = mImpl->mColorConstraint;
670 bool GridLayout::GetVisibilityConstraint(unsigned int itemId, ItemLayout::BoolFunction& constraint) const
672 unsigned int columnIndex = itemId % mImpl->mNumberOfColumns;
674 if (IsVertical(mOrientation))
676 constraint = GridVisibilityConstraintPortrait(columnIndex, mImpl->mNumberOfColumns, mImpl->mRowSpacing, mImpl->mColumnSpacing, mImpl->mSideMargin, mImpl->mItemSizeFunction);
680 constraint = GridVisibilityConstraintLandscape(columnIndex, mImpl->mNumberOfColumns, mImpl->mRowSpacing, mImpl->mColumnSpacing, mImpl->mSideMargin, mImpl->mItemSizeFunction);
686 Degree GridLayout::GetScrollDirection() const
688 Degree scrollDirection(0.0f);
690 if (mOrientation == ControlOrientation::Up)
692 scrollDirection = 0.0f;
694 else if (mOrientation == ControlOrientation::Left)
696 scrollDirection = 90.0f;
698 else if (mOrientation == ControlOrientation::Down)
700 scrollDirection = 180.0f;
702 else // mOrientation == ControlOrientation::Right
704 scrollDirection = 270.0f;
707 return scrollDirection;
710 int GridLayout::GetNextFocusItemID(int itemID, int maxItems, Dali::Toolkit::Control::KeyboardFocusNavigationDirection direction, bool loopEnabled)
719 itemID = loopEnabled ? maxItems - 1 : 0;
725 itemID -= mImpl->mNumberOfColumns;
728 itemID = loopEnabled ? itemID + maxItems : itemID + mImpl->mNumberOfColumns;
735 if( itemID >= maxItems )
737 itemID = loopEnabled ? 0 : maxItems - 1;
743 itemID += mImpl->mNumberOfColumns;
744 if( itemID >= maxItems )
746 itemID = loopEnabled ? 0 : itemID - mImpl->mNumberOfColumns;
754 GridLayout::GridLayout()
760 } // namespace Toolkit