mirror of
https://github.com/juce-framework/JUCE.git
synced 2026-01-11 23:54:18 +00:00
335 lines
11 KiB
C++
335 lines
11 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE 6 technical preview.
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Copyright (c) 2020 - Raw Material Software Limited
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You may use this code under the terms of the GPL v3
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(see www.gnu.org/licenses).
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For this technical preview, this file is not subject to commercial licensing.
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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StretchableLayoutManager::StretchableLayoutManager() {}
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StretchableLayoutManager::~StretchableLayoutManager() {}
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//==============================================================================
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void StretchableLayoutManager::clearAllItems()
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{
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items.clear();
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totalSize = 0;
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}
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void StretchableLayoutManager::setItemLayout (const int itemIndex,
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const double minimumSize,
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const double maximumSize,
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const double preferredSize)
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{
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auto* layout = getInfoFor (itemIndex);
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if (layout == nullptr)
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{
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layout = new ItemLayoutProperties();
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layout->itemIndex = itemIndex;
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int i;
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for (i = 0; i < items.size(); ++i)
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if (items.getUnchecked (i)->itemIndex > itemIndex)
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break;
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items.insert (i, layout);
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}
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layout->minSize = minimumSize;
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layout->maxSize = maximumSize;
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layout->preferredSize = preferredSize;
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layout->currentSize = 0;
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}
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bool StretchableLayoutManager::getItemLayout (const int itemIndex,
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double& minimumSize,
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double& maximumSize,
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double& preferredSize) const
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{
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if (auto* layout = getInfoFor (itemIndex))
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{
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minimumSize = layout->minSize;
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maximumSize = layout->maxSize;
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preferredSize = layout->preferredSize;
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return true;
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}
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return false;
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}
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//==============================================================================
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void StretchableLayoutManager::setTotalSize (const int newTotalSize)
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{
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totalSize = newTotalSize;
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fitComponentsIntoSpace (0, items.size(), totalSize, 0);
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}
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int StretchableLayoutManager::getItemCurrentPosition (const int itemIndex) const
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{
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int pos = 0;
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for (int i = 0; i < itemIndex; ++i)
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if (auto* layout = getInfoFor (i))
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pos += layout->currentSize;
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return pos;
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}
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int StretchableLayoutManager::getItemCurrentAbsoluteSize (const int itemIndex) const
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{
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if (auto* layout = getInfoFor (itemIndex))
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return layout->currentSize;
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return 0;
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}
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double StretchableLayoutManager::getItemCurrentRelativeSize (const int itemIndex) const
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{
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if (auto* layout = getInfoFor (itemIndex))
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return -layout->currentSize / (double) totalSize;
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return 0;
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}
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void StretchableLayoutManager::setItemPosition (const int itemIndex,
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int newPosition)
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{
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for (int i = items.size(); --i >= 0;)
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{
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auto* layout = items.getUnchecked(i);
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if (layout->itemIndex == itemIndex)
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{
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auto realTotalSize = jmax (totalSize, getMinimumSizeOfItems (0, items.size()));
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auto minSizeAfterThisComp = getMinimumSizeOfItems (i, items.size());
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auto maxSizeAfterThisComp = getMaximumSizeOfItems (i + 1, items.size());
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newPosition = jmax (newPosition, totalSize - maxSizeAfterThisComp - layout->currentSize);
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newPosition = jmin (newPosition, realTotalSize - minSizeAfterThisComp);
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auto endPos = fitComponentsIntoSpace (0, i, newPosition, 0);
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endPos += layout->currentSize;
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fitComponentsIntoSpace (i + 1, items.size(), totalSize - endPos, endPos);
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updatePrefSizesToMatchCurrentPositions();
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break;
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}
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}
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}
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//==============================================================================
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void StretchableLayoutManager::layOutComponents (Component** const components,
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int numComponents,
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int x, int y, int w, int h,
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const bool vertically,
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const bool resizeOtherDimension)
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{
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setTotalSize (vertically ? h : w);
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int pos = vertically ? y : x;
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for (int i = 0; i < numComponents; ++i)
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{
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if (auto* layout = getInfoFor (i))
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{
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if (auto* c = components[i])
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{
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if (i == numComponents - 1)
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{
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// if it's the last item, crop it to exactly fit the available space..
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if (resizeOtherDimension)
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{
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if (vertically)
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c->setBounds (x, pos, w, jmax (layout->currentSize, h - pos));
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else
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c->setBounds (pos, y, jmax (layout->currentSize, w - pos), h);
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}
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else
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{
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if (vertically)
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c->setBounds (c->getX(), pos, c->getWidth(), jmax (layout->currentSize, h - pos));
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else
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c->setBounds (pos, c->getY(), jmax (layout->currentSize, w - pos), c->getHeight());
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}
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}
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else
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{
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if (resizeOtherDimension)
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{
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if (vertically)
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c->setBounds (x, pos, w, layout->currentSize);
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else
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c->setBounds (pos, y, layout->currentSize, h);
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}
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else
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{
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if (vertically)
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c->setBounds (c->getX(), pos, c->getWidth(), layout->currentSize);
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else
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c->setBounds (pos, c->getY(), layout->currentSize, c->getHeight());
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}
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}
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}
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pos += layout->currentSize;
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}
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}
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}
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//==============================================================================
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StretchableLayoutManager::ItemLayoutProperties* StretchableLayoutManager::getInfoFor (const int itemIndex) const
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{
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for (auto* i : items)
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if (i->itemIndex == itemIndex)
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return i;
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return nullptr;
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}
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int StretchableLayoutManager::fitComponentsIntoSpace (const int startIndex,
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const int endIndex,
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const int availableSpace,
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int startPos)
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{
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// calculate the total sizes
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double totalIdealSize = 0.0;
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int totalMinimums = 0;
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for (int i = startIndex; i < endIndex; ++i)
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{
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auto* layout = items.getUnchecked (i);
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layout->currentSize = sizeToRealSize (layout->minSize, totalSize);
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totalMinimums += layout->currentSize;
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totalIdealSize += sizeToRealSize (layout->preferredSize, totalSize);
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}
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if (totalIdealSize <= 0)
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totalIdealSize = 1.0;
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// now calc the best sizes..
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int extraSpace = availableSpace - totalMinimums;
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while (extraSpace > 0)
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{
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int numWantingMoreSpace = 0;
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int numHavingTakenExtraSpace = 0;
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// first figure out how many comps want a slice of the extra space..
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for (int i = startIndex; i < endIndex; ++i)
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{
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auto* layout = items.getUnchecked (i);
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auto sizeWanted = sizeToRealSize (layout->preferredSize, totalSize);
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auto bestSize = jlimit (layout->currentSize,
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jmax (layout->currentSize,
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sizeToRealSize (layout->maxSize, totalSize)),
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roundToInt (sizeWanted * availableSpace / totalIdealSize));
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if (bestSize > layout->currentSize)
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++numWantingMoreSpace;
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}
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// ..share out the extra space..
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for (int i = startIndex; i < endIndex; ++i)
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{
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auto* layout = items.getUnchecked (i);
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auto sizeWanted = sizeToRealSize (layout->preferredSize, totalSize);
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auto bestSize = jlimit (layout->currentSize,
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jmax (layout->currentSize, sizeToRealSize (layout->maxSize, totalSize)),
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roundToInt (sizeWanted * availableSpace / totalIdealSize));
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auto extraWanted = bestSize - layout->currentSize;
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if (extraWanted > 0)
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{
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auto extraAllowed = jmin (extraWanted,
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extraSpace / jmax (1, numWantingMoreSpace));
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if (extraAllowed > 0)
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{
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++numHavingTakenExtraSpace;
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--numWantingMoreSpace;
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layout->currentSize += extraAllowed;
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extraSpace -= extraAllowed;
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}
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}
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}
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if (numHavingTakenExtraSpace <= 0)
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break;
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}
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// ..and calculate the end position
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for (int i = startIndex; i < endIndex; ++i)
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{
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auto* layout = items.getUnchecked(i);
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startPos += layout->currentSize;
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}
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return startPos;
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}
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int StretchableLayoutManager::getMinimumSizeOfItems (const int startIndex,
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const int endIndex) const
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{
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int totalMinimums = 0;
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for (int i = startIndex; i < endIndex; ++i)
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totalMinimums += sizeToRealSize (items.getUnchecked (i)->minSize, totalSize);
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return totalMinimums;
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}
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int StretchableLayoutManager::getMaximumSizeOfItems (const int startIndex, const int endIndex) const
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{
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int totalMaximums = 0;
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for (int i = startIndex; i < endIndex; ++i)
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totalMaximums += sizeToRealSize (items.getUnchecked (i)->maxSize, totalSize);
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return totalMaximums;
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}
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void StretchableLayoutManager::updatePrefSizesToMatchCurrentPositions()
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{
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for (int i = 0; i < items.size(); ++i)
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{
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auto* layout = items.getUnchecked (i);
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layout->preferredSize
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= (layout->preferredSize < 0) ? getItemCurrentRelativeSize (i)
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: getItemCurrentAbsoluteSize (i);
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}
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}
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int StretchableLayoutManager::sizeToRealSize (double size, int totalSpace)
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{
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if (size < 0)
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size *= -totalSpace;
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return roundToInt (size);
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}
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} // namespace juce
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