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.
19 #include <dali-toolkit/public-api/controls/scrollable/item-view/grid-layout.h>
23 #include <dali/public-api/animation/animation.h>
26 using namespace Dali::Toolkit;
29 namespace // unnamed namespace
32 const unsigned int DEFAULT_NUMBER_OF_COLUMNS = 4;
33 const float DEFAULT_TOP_MARGIN = 95.0f;
34 const float DEFAULT_BOTTOM_MARGIN = 20.0f;
35 const float DEFAULT_SIDE_MARGIN = 20.0f;
36 const float DEFAULT_COLUMN_SPACING = 20.0f;
37 const float DEFAULT_ROW_SPACING = 20.0f;
38 const float DEFAULT_SCROLL_SPEED_FACTOR = 0.03f;
39 const float DEFAULT_MAXIMUM_SWIPE_SPEED = 100.0f;
40 const float DEFAULT_ITEM_FLICK_ANIMATION_DURATION = 0.015f;
42 // 4 orientations are supported
43 static const unsigned int ORIENTATION_COUNT = 4;
45 static Vector3 GetItemSizeDefaultFunction(unsigned int numberOfColumns, float layoutWidth, float sideMargin, float columnSpacing)
47 float width = (layoutWidth - sideMargin * 2.0f - columnSpacing * static_cast<float>(numberOfColumns - 1)) / static_cast<float>(numberOfColumns);
50 return Vector3(width, width * 0.75f, width * 0.75f);
53 struct GridPositionConstraint0
55 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)
56 : mColumnIndex(columnIndex),
57 mNumberOfColumns(numberOfColumns),
58 mRowSpacing(rowSpacing),
59 mColumnSpacing(columnSpacing),
60 mTopMargin(topMargin),
61 mSideMargin(sideMargin),
62 mItemSizeFunction(itemSizeFunction),
67 Vector3 operator()(const Vector3& current, const float& layoutPosition, const float& scrollSpeed, const Vector3& layoutSize)
69 Vector3 itemSize = mItemSizeFunction(mNumberOfColumns, layoutSize.width, mSideMargin, mColumnSpacing);
71 return Vector3(mSideMargin + (mColumnIndex * (itemSize.x + mColumnSpacing)) + itemSize.x * 0.5f - layoutSize.x * 0.5f,
72 ((itemSize.y + mRowSpacing) * (layoutPosition - mColumnIndex)) / mNumberOfColumns - layoutSize.height * 0.5f + itemSize.y * 0.5f + mTopMargin,
73 mColumnIndex * mZGap);
78 unsigned int mColumnIndex;
79 unsigned int mNumberOfColumns;
84 GridLayout::ItemSizeFunction mItemSizeFunction;
88 struct GridPositionConstraint90
90 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)
91 : mColumnIndex(columnIndex),
92 mNumberOfColumns(numberOfColumns),
93 mRowSpacing(rowSpacing),
94 mColumnSpacing(columnSpacing),
95 mTopMargin(topMargin),
96 mSideMargin(sideMargin),
97 mItemSizeFunction(itemSizeFunction),
102 Vector3 operator()(const Vector3& current, const float& layoutPosition, const float& scrollSpeed, const Vector3& layoutSize)
104 Vector3 itemSize = mItemSizeFunction(mNumberOfColumns, layoutSize.height, mSideMargin, mColumnSpacing);
106 return Vector3(((itemSize.y + mRowSpacing) * (layoutPosition - mColumnIndex)) / mNumberOfColumns - layoutSize.width * 0.5f + itemSize.y * 0.5f + mTopMargin,
107 -(mSideMargin + (mColumnIndex * (itemSize.x + mColumnSpacing)) + itemSize.x * 0.5f - layoutSize.y*0.5f),
108 mColumnIndex * mZGap);
113 unsigned int mColumnIndex;
114 unsigned int mNumberOfColumns;
116 float mColumnSpacing;
119 GridLayout::ItemSizeFunction mItemSizeFunction;
123 struct GridPositionConstraint180
125 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)
126 : mColumnIndex(columnIndex),
127 mNumberOfColumns(numberOfColumns),
128 mRowSpacing(rowSpacing),
129 mColumnSpacing(columnSpacing),
130 mTopMargin(topMargin),
131 mSideMargin(sideMargin),
132 mItemSizeFunction(itemSizeFunction),
137 Vector3 operator()(const Vector3& current, const float& layoutPosition, const float& scrollSpeed, const Vector3& layoutSize)
139 Vector3 itemSize = mItemSizeFunction(mNumberOfColumns, layoutSize.width, mSideMargin, mColumnSpacing);
141 return Vector3(-(mSideMargin + (mColumnIndex * (itemSize.x + mColumnSpacing)) + itemSize.x * 0.5f - layoutSize.x * 0.5f),
142 -(((itemSize.y + mRowSpacing) * (layoutPosition - mColumnIndex)) / mNumberOfColumns - layoutSize.height * 0.5f + itemSize.y * 0.5f + mTopMargin),
143 mColumnIndex * mZGap);
148 unsigned int mColumnIndex;
149 unsigned int mNumberOfColumns;
151 float mColumnSpacing;
154 GridLayout::ItemSizeFunction mItemSizeFunction;
158 struct GridPositionConstraint270
160 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)
161 : mColumnIndex(columnIndex),
162 mNumberOfColumns(numberOfColumns),
163 mRowSpacing(rowSpacing),
164 mColumnSpacing(columnSpacing),
165 mTopMargin(topMargin),
166 mSideMargin(sideMargin),
167 mItemSizeFunction(itemSizeFunction),
172 Vector3 operator()(const Vector3& current, const float& layoutPosition, const float& scrollSpeed, const Vector3& layoutSize)
174 Vector3 itemSize = mItemSizeFunction(mNumberOfColumns, layoutSize.height, mSideMargin, mColumnSpacing);
176 return Vector3(-(((itemSize.y + mRowSpacing) * (layoutPosition - mColumnIndex)) / mNumberOfColumns - layoutSize.width * 0.5f + itemSize.y * 0.5f + mTopMargin),
177 mSideMargin + (mColumnIndex * (itemSize.x + mColumnSpacing)) + itemSize.x * 0.5f - layoutSize.y * 0.5f,
178 mColumnIndex * mZGap);
183 unsigned int mColumnIndex;
184 unsigned int mNumberOfColumns;
186 float mColumnSpacing;
189 GridLayout::ItemSizeFunction mItemSizeFunction;
193 struct GridRotationConstraint0
195 Quaternion operator()(const Quaternion& current, const float& layoutPosition, const float& scrollSpeed, const Vector3& layoutSize)
197 return Quaternion(0.0f, Vector3::ZAXIS);
201 struct GridRotationConstraint90
203 Quaternion operator()(const Quaternion& current, const float& layoutPosition, const float& scrollSpeed, const Vector3& layoutSize)
205 return Quaternion(1.5f * Math::PI, Vector3::ZAXIS);
209 struct GridRotationConstraint180
211 Quaternion operator()(const Quaternion& current, const float& layoutPosition, const float& scrollSpeed, const Vector3& layoutSize)
213 return Quaternion(Math::PI, Vector3::ZAXIS);
217 struct GridRotationConstraint270
219 Quaternion operator()(const Quaternion& current, const float& layoutPosition, const float& scrollSpeed, const Vector3& layoutSize)
221 return Quaternion(0.5f * Math::PI, Vector3::ZAXIS);
225 struct GridColorConstraint
227 Vector4 operator()(const Vector4& current, const float& layoutPosition, const float& scrollSpeed, const Vector3& layoutSize)
229 return Vector4( 1.0f, 1.0f, 1.0f, current.a );
233 struct GridVisibilityConstraintPortrait
235 GridVisibilityConstraintPortrait(const unsigned int columnIndex, const unsigned int numberOfColumns, const float rowSpacing, const float columnSpacing, const float sideMargin, GridLayout::ItemSizeFunction itemSizeFunction)
236 : mColumnIndex(columnIndex),
237 mNumberOfColumns(numberOfColumns),
238 mRowSpacing(rowSpacing),
239 mColumnSpacing(columnSpacing),
240 mSideMargin(sideMargin),
241 mItemSizeFunction(itemSizeFunction)
245 bool operator()(const bool& current, const float& layoutPosition, const float& scrollSpeed, const Vector3& layoutSize)
247 Vector3 itemSize = mItemSizeFunction(mNumberOfColumns, layoutSize.width, mSideMargin, mColumnSpacing);
249 float row = (layoutPosition - static_cast<float>(mColumnIndex)) / mNumberOfColumns;
250 int rowsPerPage = ceil(layoutSize.height / (itemSize.y + mRowSpacing));
252 return (row > -2.0f) && (row < rowsPerPage);
257 unsigned int mColumnIndex;
258 unsigned int mNumberOfColumns;
260 float mColumnSpacing;
262 GridLayout::ItemSizeFunction mItemSizeFunction;
265 struct GridVisibilityConstraintLandscape
267 GridVisibilityConstraintLandscape(const unsigned int columnIndex, const unsigned int numberOfColumns, const float rowSpacing, const float columnSpacing, const float sideMargin, GridLayout::ItemSizeFunction itemSizeFunction)
268 : mColumnIndex(columnIndex),
269 mNumberOfColumns(numberOfColumns),
270 mRowSpacing(rowSpacing),
271 mColumnSpacing(columnSpacing),
272 mSideMargin(sideMargin),
273 mItemSizeFunction(itemSizeFunction)
277 bool operator()(const bool& current, const float& layoutPosition, const float& scrollSpeed, const Vector3& layoutSize)
279 Vector3 itemSize = mItemSizeFunction(mNumberOfColumns, layoutSize.height, mSideMargin, mColumnSpacing);
281 float row = (layoutPosition - static_cast<float>(mColumnIndex)) / mNumberOfColumns;
282 int rowsPerPage = ceil(layoutSize.width / (itemSize.y + mRowSpacing));
284 return (row > -2.0f) && (row < rowsPerPage);
289 unsigned int mColumnIndex;
290 unsigned int mNumberOfColumns;
292 float mColumnSpacing;
294 GridLayout::ItemSizeFunction mItemSizeFunction;
297 } // unnamed namespace
305 struct GridLayout::Impl
308 : mNumberOfColumns(DEFAULT_NUMBER_OF_COLUMNS),
309 mRowSpacing(DEFAULT_ROW_SPACING),
310 mColumnSpacing(DEFAULT_COLUMN_SPACING),
311 mTopMargin(DEFAULT_TOP_MARGIN),
312 mBottomMargin(DEFAULT_BOTTOM_MARGIN),
313 mSideMargin(DEFAULT_SIDE_MARGIN),
314 mScrollSpeedFactor(DEFAULT_SCROLL_SPEED_FACTOR),
315 mMaximumSwipeSpeed(DEFAULT_MAXIMUM_SWIPE_SPEED),
316 mItemFlickAnimationDuration(DEFAULT_ITEM_FLICK_ANIMATION_DURATION),
317 mItemSizeFunction(GetItemSizeDefaultFunction)
319 mColorConstraint = GridColorConstraint();
321 mRotationConstraint[0] = GridRotationConstraint0();
322 mRotationConstraint[1] = GridRotationConstraint90();
323 mRotationConstraint[2] = GridRotationConstraint180();
324 mRotationConstraint[3] = GridRotationConstraint270();
327 unsigned int mNumberOfColumns;
329 float mColumnSpacing;
335 float mScrollSpeedFactor;
336 float mMaximumSwipeSpeed;
337 float mItemFlickAnimationDuration;
339 ItemLayout::QuaternionFunction mRotationConstraint[ORIENTATION_COUNT];
340 ItemLayout::Vector4Function mColorConstraint;
342 ItemSizeFunction mItemSizeFunction;
345 GridLayoutPtr GridLayout::New()
347 return GridLayoutPtr(new GridLayout());
350 GridLayout::~GridLayout()
355 void GridLayout::SetNumberOfColumns(unsigned int columns)
357 mImpl->mNumberOfColumns = columns;
360 unsigned int GridLayout::GetNumberOfColumns() const
362 return mImpl->mNumberOfColumns;
365 void GridLayout::SetRowSpacing(float spacing)
367 mImpl->mRowSpacing = spacing;
370 float GridLayout::GetRowSpacing() const
372 return mImpl->mRowSpacing;
375 void GridLayout::SetColumnSpacing(float spacing)
377 mImpl->mColumnSpacing = spacing;
380 float GridLayout::GetColumnSpacing() const
382 return mImpl->mColumnSpacing;
385 void GridLayout::SetTopMargin(float margin)
387 mImpl->mTopMargin = margin;
390 float GridLayout::GetTopMargin() const
392 return mImpl->mTopMargin;
395 void GridLayout::SetBottomMargin(float margin)
397 mImpl->mBottomMargin = margin;
400 float GridLayout::GetBottomMargin() const
402 return mImpl->mBottomMargin;
405 void GridLayout::SetSideMargin(float margin)
407 mImpl->mSideMargin = margin;
410 float GridLayout::GetSideMargin() const
412 return mImpl->mSideMargin;
415 void GridLayout::SetZGap(float gap)
420 float GridLayout::GetZGap() const
425 void GridLayout::SetItemSizeFunction(ItemSizeFunction function)
427 mImpl->mItemSizeFunction = function;
430 GridLayout::ItemSizeFunction GridLayout::GetItemSizeFunction() const
432 return mImpl->mItemSizeFunction;
435 void GridLayout::SetScrollSpeedFactor(float scrollSpeed)
437 mImpl->mScrollSpeedFactor = scrollSpeed;
440 void GridLayout::SetMaximumSwipeSpeed(float speed)
442 mImpl->mMaximumSwipeSpeed = speed;
445 void GridLayout::SetItemFlickAnimationDuration(float durationSeconds)
447 mImpl->mItemFlickAnimationDuration = durationSeconds;
450 float GridLayout::GetScrollSpeedFactor() const
452 return mImpl->mScrollSpeedFactor;
455 float GridLayout::GetMaximumSwipeSpeed() const
457 return mImpl->mMaximumSwipeSpeed;
460 float GridLayout::GetItemFlickAnimationDuration() const
462 return mImpl->mItemFlickAnimationDuration;
465 float GridLayout::GetMinimumLayoutPosition(unsigned int numberOfItems, Vector3 layoutSize) const
467 float layoutWidth = IsHorizontal(mOrientation) ? layoutSize.height : layoutSize.width;
468 float layoutHeight = IsHorizontal(mOrientation) ? layoutSize.width : layoutSize.height;
470 Vector3 itemSize = mImpl->mItemSizeFunction( mImpl->mNumberOfColumns, layoutWidth, mImpl->mSideMargin, mImpl->mColumnSpacing);
472 unsigned int itemsLastRow = numberOfItems % mImpl->mNumberOfColumns;
473 if (itemsLastRow == 0)
475 itemsLastRow = mImpl->mNumberOfColumns;
478 float rowsLastPage = (layoutHeight - mImpl->mBottomMargin - mImpl->mTopMargin + mImpl->mRowSpacing) / (itemSize.y + mImpl->mRowSpacing);
479 float itemsLastPage = (rowsLastPage - 1.0f) * static_cast<float>(mImpl->mNumberOfColumns) + static_cast<float>(itemsLastRow);
481 return itemsLastPage - static_cast<float>(numberOfItems);
484 float GridLayout::GetClosestAnchorPosition(float layoutPosition) const
486 float rowIndex = static_cast<float>(round(layoutPosition / mImpl->mNumberOfColumns));
487 return rowIndex * static_cast<float>(mImpl->mNumberOfColumns);
490 float GridLayout::GetItemScrollToPosition(unsigned int itemId) const
492 float rowIndex = static_cast<float>(itemId / mImpl->mNumberOfColumns);
493 return -rowIndex * static_cast<float>(mImpl->mNumberOfColumns);
496 ItemRange GridLayout::GetItemsWithinArea(float firstItemPosition, Vector3 layoutSize) const
498 float layoutWidth = IsHorizontal(mOrientation) ? layoutSize.height : layoutSize.width;
499 float layoutHeight = IsHorizontal(mOrientation) ? layoutSize.width : layoutSize.height;
501 Vector3 itemSize = mImpl->mItemSizeFunction( mImpl->mNumberOfColumns, layoutWidth, mImpl->mSideMargin, mImpl->mColumnSpacing);
503 int itemsPerPage = mImpl->mNumberOfColumns * ceil(layoutHeight / (itemSize.y + mImpl->mRowSpacing));
504 int firstVisibleItem = -(static_cast<int>(firstItemPosition / mImpl->mNumberOfColumns)) * mImpl->mNumberOfColumns;
506 int firstItemIndex = std::max(0, firstVisibleItem - static_cast<int>(mImpl->mNumberOfColumns));
507 int lastItemIndex = std::max(0, firstVisibleItem + itemsPerPage);
509 return ItemRange(firstItemIndex, lastItemIndex);
512 float GridLayout::GetClosestOnScreenLayoutPosition(int itemID, float currentLayoutPosition, const Vector3& layoutSize)
514 ItemLayout::Vector3Function positionConstraint;
515 Vector3 itemPosition = Vector3::ZERO;
516 if (GetPositionConstraint(itemID, positionConstraint))
518 itemPosition = positionConstraint(Vector3::ZERO, currentLayoutPosition + itemID, 0.0f, layoutSize);
521 GetItemSize(itemID, layoutSize, itemSize);
522 Vector3 onScreenArea = (layoutSize - (IsVertical(mOrientation) ? itemSize : Vector3(itemSize.y, itemSize.x, itemSize.z))) * 0.5f;
523 if (itemPosition.x < -onScreenArea.x
524 || itemPosition.x > onScreenArea.x
525 || itemPosition.y < -onScreenArea.y
526 || itemPosition.y > onScreenArea.y)
528 // item not within viewable area
529 float rowHeight = itemSize.y + mImpl->mRowSpacing;
530 ItemLayout::Vector3Function firstItemPositionConstraint;
531 Vector3 firstItemPosition = Vector3::ZERO;
533 if (GetPositionConstraint(0, firstItemPositionConstraint))
535 firstItemPosition = firstItemPositionConstraint(Vector3::ZERO, 0.0f, 0.0f, layoutSize);
537 switch( mOrientation )
539 case ControlOrientation::Up:
541 if(itemPosition.y > onScreenArea.y)
543 offset = ((layoutSize.y - rowHeight) * 0.5f) - firstItemPosition.y;
547 offset = ((-layoutSize.y + rowHeight) * 0.5f) - firstItemPosition.y;
551 case ControlOrientation::Down:
553 if(itemPosition.y < -onScreenArea.y)
555 offset = ((layoutSize.y - rowHeight) * 0.5f) - firstItemPosition.y;
559 offset = ((-layoutSize.y + rowHeight) * 0.5f) - firstItemPosition.y;
563 case ControlOrientation::Left:
565 if(itemPosition.x > onScreenArea.x)
567 offset = ((layoutSize.x - rowHeight) * 0.5f) - firstItemPosition.x;
571 offset = ((-layoutSize.x + rowHeight) * 0.5f) - firstItemPosition.x;
575 case ControlOrientation::Right:
577 if(itemPosition.x < -onScreenArea.x)
579 offset = ((layoutSize.x - rowHeight) * 0.5f) - firstItemPosition.x;
583 offset = ((-layoutSize.x + rowHeight) * 0.5f) - firstItemPosition.x;
588 // work out number of rows from first item position to an item aligned to bottom of screen
589 float rowDiff = offset / rowHeight;
590 float layoutPositionOffset = rowDiff * mImpl->mNumberOfColumns;
591 float scrollTo = GetItemScrollToPosition(itemID) + layoutPositionOffset;
594 return currentLayoutPosition;
597 unsigned int GridLayout::GetReserveItemCount(Vector3 layoutSize) const
599 float layoutWidth = IsHorizontal(mOrientation) ? layoutSize.height : layoutSize.width;
600 float layoutHeight = IsHorizontal(mOrientation) ? layoutSize.width : layoutSize.height;
602 Vector3 itemSize = mImpl->mItemSizeFunction( mImpl->mNumberOfColumns, layoutWidth, mImpl->mSideMargin, mImpl->mColumnSpacing);
603 int itemsPerPage = mImpl->mNumberOfColumns * ceil(layoutHeight / (itemSize.y + mImpl->mRowSpacing));
607 bool GridLayout::GetItemSize(unsigned int itemId, Vector3 layoutSize, Vector3& itemSize) const
609 // Note: itemId is not checked, since every item has the same size
611 itemSize = mImpl->mItemSizeFunction( mImpl->mNumberOfColumns, (IsHorizontal(mOrientation) ? layoutSize.height : layoutSize.width), mImpl->mSideMargin, mImpl->mColumnSpacing);
615 void GridLayout::GetResizeAnimation(Animation& animation, Actor actor, Vector3 size, float durationSeconds) const
619 Vector3 currentSize( actor.GetCurrentSize() );
620 Vector3 shrink( currentSize );
622 shrink.width = min(size.width, currentSize.width);
623 shrink.height = min(size.height, currentSize.height);
625 // Do a nonlinear size animation to shrink the actor first when the actor size changes,
626 // so that we can avoid the actors overlapping during orientation change.
627 animation.Resize( actor, shrink, AlphaFunctions::EaseOut, 0.0f, durationSeconds * 0.5f );
628 animation.Resize( actor, size, AlphaFunctions::EaseIn, 0.0f, durationSeconds );
632 bool GridLayout::GetPositionConstraint(unsigned int itemId, ItemLayout::Vector3Function& constraint) const
634 unsigned int columnIndex = itemId % mImpl->mNumberOfColumns;
636 if (mOrientation == ControlOrientation::Up)
638 constraint = GridPositionConstraint0(columnIndex, mImpl->mNumberOfColumns, mImpl->mRowSpacing, mImpl->mColumnSpacing, mImpl->mTopMargin, mImpl->mSideMargin, mImpl->mItemSizeFunction, mImpl->mZGap);
640 else if (mOrientation == ControlOrientation::Left)
642 constraint = GridPositionConstraint90(columnIndex, mImpl->mNumberOfColumns, mImpl->mRowSpacing, mImpl->mColumnSpacing, mImpl->mTopMargin, mImpl->mSideMargin, mImpl->mItemSizeFunction, mImpl->mZGap);
644 else if (mOrientation == ControlOrientation::Down)
646 constraint = GridPositionConstraint180(columnIndex, mImpl->mNumberOfColumns, mImpl->mRowSpacing, mImpl->mColumnSpacing, mImpl->mTopMargin, mImpl->mSideMargin, mImpl->mItemSizeFunction, mImpl->mZGap);
648 else // mOrientation == ControlOrientation::Right
650 constraint = GridPositionConstraint270(columnIndex, mImpl->mNumberOfColumns, mImpl->mRowSpacing, mImpl->mColumnSpacing, mImpl->mTopMargin, mImpl->mSideMargin, mImpl->mItemSizeFunction, mImpl->mZGap);
656 bool GridLayout::GetRotationConstraint(unsigned int itemId, ItemLayout::QuaternionFunction& constraint) const
658 constraint = mImpl->mRotationConstraint[mOrientation];
662 bool GridLayout::GetScaleConstraint(unsigned int itemId, ItemLayout::Vector3Function& constraint) const
664 return false; // No scaling
667 bool GridLayout::GetColorConstraint(unsigned int itemId, ItemLayout::Vector4Function& constraint) const
669 constraint = mImpl->mColorConstraint;
673 bool GridLayout::GetVisibilityConstraint(unsigned int itemId, ItemLayout::BoolFunction& constraint) const
675 unsigned int columnIndex = itemId % mImpl->mNumberOfColumns;
677 if (IsVertical(mOrientation))
679 constraint = GridVisibilityConstraintPortrait(columnIndex, mImpl->mNumberOfColumns, mImpl->mRowSpacing, mImpl->mColumnSpacing, mImpl->mSideMargin, mImpl->mItemSizeFunction);
683 constraint = GridVisibilityConstraintLandscape(columnIndex, mImpl->mNumberOfColumns, mImpl->mRowSpacing, mImpl->mColumnSpacing, mImpl->mSideMargin, mImpl->mItemSizeFunction);
689 Degree GridLayout::GetScrollDirection() const
691 Degree scrollDirection(0.0f);
693 if (mOrientation == ControlOrientation::Up)
695 scrollDirection = 0.0f;
697 else if (mOrientation == ControlOrientation::Left)
699 scrollDirection = 90.0f;
701 else if (mOrientation == ControlOrientation::Down)
703 scrollDirection = 180.0f;
705 else // mOrientation == ControlOrientation::Right
707 scrollDirection = 270.0f;
710 return scrollDirection;
713 int GridLayout::GetNextFocusItemID(int itemID, int maxItems, Dali::Toolkit::Control::KeyboardFocusNavigationDirection direction, bool loopEnabled)
722 itemID = loopEnabled ? maxItems - 1 : 0;
728 itemID -= mImpl->mNumberOfColumns;
731 itemID = loopEnabled ? itemID + maxItems : itemID + mImpl->mNumberOfColumns;
738 if( itemID >= maxItems )
740 itemID = loopEnabled ? 0 : maxItems - 1;
746 itemID += mImpl->mNumberOfColumns;
747 if( itemID >= maxItems )
749 itemID = loopEnabled ? 0 : itemID - mImpl->mNumberOfColumns;
757 GridLayout::GridLayout()
763 } // namespace Toolkit