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/*
==============================================================================
This file is part of the JUCE library.
Copyright (c) 2022 - Raw Material Software Limited
JUCE is an open source library subject to commercial or open-source
licensing.
By using JUCE, you agree to the terms of both the JUCE 7 End-User License
Agreement and JUCE Privacy Policy.
End User License Agreement: www.juce.com/juce-7-licence
Privacy Policy: www.juce.com/juce-privacy-policy
Or: You may also use this code under the terms of the GPL v3 (see
www.gnu.org/licenses).
JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
DISCLAIMED.
==============================================================================
*/
namespace juce
{
StretchableLayoutManager::StretchableLayoutManager() {}
StretchableLayoutManager::~StretchableLayoutManager() {}
//==============================================================================
void StretchableLayoutManager::clearAllItems()
{
items.clear();
totalSize = 0;
}
void StretchableLayoutManager::setItemLayout (const int itemIndex,
const double minimumSize,
const double maximumSize,
const double preferredSize)
{
auto* layout = getInfoFor (itemIndex);
if (layout == nullptr)
{
layout = new ItemLayoutProperties();
layout->itemIndex = itemIndex;
int i;
for (i = 0; i < items.size(); ++i)
if (items.getUnchecked (i)->itemIndex > itemIndex)
break;
items.insert (i, layout);
}
layout->minSize = minimumSize;
layout->maxSize = maximumSize;
layout->preferredSize = preferredSize;
layout->currentSize = 0;
}
bool StretchableLayoutManager::getItemLayout (const int itemIndex,
double& minimumSize,
double& maximumSize,
double& preferredSize) const
{
if (auto* layout = getInfoFor (itemIndex))
{
minimumSize = layout->minSize;
maximumSize = layout->maxSize;
preferredSize = layout->preferredSize;
return true;
}
return false;
}
//==============================================================================
void StretchableLayoutManager::setTotalSize (const int newTotalSize)
{
totalSize = newTotalSize;
fitComponentsIntoSpace (0, items.size(), totalSize, 0);
}
int StretchableLayoutManager::getItemCurrentPosition (const int itemIndex) const
{
int pos = 0;
for (int i = 0; i < itemIndex; ++i)
if (auto* layout = getInfoFor (i))
pos += layout->currentSize;
return pos;
}
int StretchableLayoutManager::getItemCurrentAbsoluteSize (const int itemIndex) const
{
if (auto* layout = getInfoFor (itemIndex))
return layout->currentSize;
return 0;
}
double StretchableLayoutManager::getItemCurrentRelativeSize (const int itemIndex) const
{
if (auto* layout = getInfoFor (itemIndex))
return -layout->currentSize / (double) totalSize;
return 0;
}
void StretchableLayoutManager::setItemPosition (const int itemIndex,
int newPosition)
{
for (int i = items.size(); --i >= 0;)
{
auto* layout = items.getUnchecked(i);
if (layout->itemIndex == itemIndex)
{
auto realTotalSize = jmax (totalSize, getMinimumSizeOfItems (0, items.size()));
auto minSizeAfterThisComp = getMinimumSizeOfItems (i, items.size());
auto maxSizeAfterThisComp = getMaximumSizeOfItems (i + 1, items.size());
newPosition = jmax (newPosition, totalSize - maxSizeAfterThisComp - layout->currentSize);
newPosition = jmin (newPosition, realTotalSize - minSizeAfterThisComp);
auto endPos = fitComponentsIntoSpace (0, i, newPosition, 0);
endPos += layout->currentSize;
fitComponentsIntoSpace (i + 1, items.size(), totalSize - endPos, endPos);
updatePrefSizesToMatchCurrentPositions();
break;
}
}
}
//==============================================================================
void StretchableLayoutManager::layOutComponents (Component** const components,
int numComponents,
int x, int y, int w, int h,
const bool vertically,
const bool resizeOtherDimension)
{
setTotalSize (vertically ? h : w);
int pos = vertically ? y : x;
for (int i = 0; i < numComponents; ++i)
{
if (auto* layout = getInfoFor (i))
{
if (auto* c = components[i])
{
if (i == numComponents - 1)
{
// if it's the last item, crop it to exactly fit the available space..
if (resizeOtherDimension)
{
if (vertically)
c->setBounds (x, pos, w, jmax (layout->currentSize, h - pos));
else
c->setBounds (pos, y, jmax (layout->currentSize, w - pos), h);
}
else
{
if (vertically)
c->setBounds (c->getX(), pos, c->getWidth(), jmax (layout->currentSize, h - pos));
else
c->setBounds (pos, c->getY(), jmax (layout->currentSize, w - pos), c->getHeight());
}
}
else
{
if (resizeOtherDimension)
{
if (vertically)
c->setBounds (x, pos, w, layout->currentSize);
else
c->setBounds (pos, y, layout->currentSize, h);
}
else
{
if (vertically)
c->setBounds (c->getX(), pos, c->getWidth(), layout->currentSize);
else
c->setBounds (pos, c->getY(), layout->currentSize, c->getHeight());
}
}
}
pos += layout->currentSize;
}
}
}
//==============================================================================
StretchableLayoutManager::ItemLayoutProperties* StretchableLayoutManager::getInfoFor (const int itemIndex) const
{
for (auto* i : items)
if (i->itemIndex == itemIndex)
return i;
return nullptr;
}
int StretchableLayoutManager::fitComponentsIntoSpace (const int startIndex,
const int endIndex,
const int availableSpace,
int startPos)
{
// calculate the total sizes
double totalIdealSize = 0.0;
int totalMinimums = 0;
for (int i = startIndex; i < endIndex; ++i)
{
auto* layout = items.getUnchecked (i);
layout->currentSize = sizeToRealSize (layout->minSize, totalSize);
totalMinimums += layout->currentSize;
totalIdealSize += sizeToRealSize (layout->preferredSize, totalSize);
}
if (totalIdealSize <= 0)
totalIdealSize = 1.0;
// now calc the best sizes..
int extraSpace = availableSpace - totalMinimums;
while (extraSpace > 0)
{
int numWantingMoreSpace = 0;
int numHavingTakenExtraSpace = 0;
// first figure out how many comps want a slice of the extra space..
for (int i = startIndex; i < endIndex; ++i)
{
auto* layout = items.getUnchecked (i);
auto sizeWanted = sizeToRealSize (layout->preferredSize, totalSize);
auto bestSize = jlimit (layout->currentSize,
jmax (layout->currentSize,
sizeToRealSize (layout->maxSize, totalSize)),
roundToInt (sizeWanted * availableSpace / totalIdealSize));
if (bestSize > layout->currentSize)
++numWantingMoreSpace;
}
// ..share out the extra space..
for (int i = startIndex; i < endIndex; ++i)
{
auto* layout = items.getUnchecked (i);
auto sizeWanted = sizeToRealSize (layout->preferredSize, totalSize);
auto bestSize = jlimit (layout->currentSize,
jmax (layout->currentSize, sizeToRealSize (layout->maxSize, totalSize)),
roundToInt (sizeWanted * availableSpace / totalIdealSize));
auto extraWanted = bestSize - layout->currentSize;
if (extraWanted > 0)
{
auto extraAllowed = jmin (extraWanted,
extraSpace / jmax (1, numWantingMoreSpace));
if (extraAllowed > 0)
{
++numHavingTakenExtraSpace;
--numWantingMoreSpace;
layout->currentSize += extraAllowed;
extraSpace -= extraAllowed;
}
}
}
if (numHavingTakenExtraSpace <= 0)
break;
}
// ..and calculate the end position
for (int i = startIndex; i < endIndex; ++i)
{
auto* layout = items.getUnchecked(i);
startPos += layout->currentSize;
}
return startPos;
}
int StretchableLayoutManager::getMinimumSizeOfItems (const int startIndex,
const int endIndex) const
{
int totalMinimums = 0;
for (int i = startIndex; i < endIndex; ++i)
totalMinimums += sizeToRealSize (items.getUnchecked (i)->minSize, totalSize);
return totalMinimums;
}
int StretchableLayoutManager::getMaximumSizeOfItems (const int startIndex, const int endIndex) const
{
int totalMaximums = 0;
for (int i = startIndex; i < endIndex; ++i)
totalMaximums += sizeToRealSize (items.getUnchecked (i)->maxSize, totalSize);
return totalMaximums;
}
void StretchableLayoutManager::updatePrefSizesToMatchCurrentPositions()
{
for (int i = 0; i < items.size(); ++i)
{
auto* layout = items.getUnchecked (i);
layout->preferredSize
= (layout->preferredSize < 0) ? getItemCurrentRelativeSize (i)
: getItemCurrentAbsoluteSize (i);
}
}
int StretchableLayoutManager::sizeToRealSize (double size, int totalSpace)
{
if (size < 0)
size *= -totalSpace;
return roundToInt (size);
}
} // namespace juce
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