439 lines
16 KiB
C++
439 lines
16 KiB
C++
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/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2020 - Raw Material Software Limited
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JUCE is an open source library subject to commercial or open-source
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licensing.
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By using JUCE, you agree to the terms of both the JUCE 6 End-User License
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Agreement and JUCE Privacy Policy (both effective as of the 16th June 2020).
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End User License Agreement: www.juce.com/juce-6-licence
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Privacy Policy: www.juce.com/juce-privacy-policy
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Or: You may also use this code under the terms of the GPL v3 (see
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www.gnu.org/licenses).
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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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Displays::Displays (Desktop& desktop)
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{
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init (desktop);
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}
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void Displays::init (Desktop& desktop)
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{
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findDisplays (desktop.getGlobalScaleFactor());
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}
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const Displays::Display* Displays::getDisplayForRect (Rectangle<int> rect, bool isPhysical) const noexcept
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{
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int maxArea = -1;
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const Display* foundDisplay = nullptr;
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for (auto& display : displays)
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{
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auto displayArea = display.totalArea;
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if (isPhysical)
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displayArea = (displayArea.withZeroOrigin() * display.scale) + display.topLeftPhysical;
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displayArea = displayArea.getIntersection (rect);
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auto area = displayArea.getWidth() * displayArea.getHeight();
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if (area >= maxArea)
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{
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maxArea = area;
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foundDisplay = &display;
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}
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}
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return foundDisplay;
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}
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const Displays::Display* Displays::getDisplayForPoint (Point<int> point, bool isPhysical) const noexcept
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{
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auto minDistance = std::numeric_limits<int>::max();
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const Display* foundDisplay = nullptr;
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for (auto& display : displays)
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{
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auto displayArea = display.totalArea;
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if (isPhysical)
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displayArea = (displayArea.withZeroOrigin() * display.scale) + display.topLeftPhysical;
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if (displayArea.contains (point))
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return &display;
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auto distance = displayArea.getCentre().getDistanceFrom (point);
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if (distance <= minDistance)
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{
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minDistance = distance;
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foundDisplay = &display;
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}
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}
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return foundDisplay;
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}
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Rectangle<int> Displays::physicalToLogical (Rectangle<int> rect, const Display* useScaleFactorOfDisplay) const noexcept
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{
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return physicalToLogical (rect.toFloat(), useScaleFactorOfDisplay).toNearestInt();
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}
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Rectangle<float> Displays::physicalToLogical (Rectangle<float> rect, const Display* useScaleFactorOfDisplay) const noexcept
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{
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const auto* display = useScaleFactorOfDisplay != nullptr ? useScaleFactorOfDisplay
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: getDisplayForRect (rect.toNearestInt(), true);
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if (display == nullptr)
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return rect;
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auto globalScale = Desktop::getInstance().getGlobalScaleFactor();
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return ((rect - display->topLeftPhysical.toFloat()) / (display->scale / globalScale))
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+ (display->totalArea.getTopLeft().toFloat() * globalScale);
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}
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Rectangle<int> Displays::logicalToPhysical (Rectangle<int> rect, const Display* useScaleFactorOfDisplay) const noexcept
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{
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return logicalToPhysical (rect.toFloat(), useScaleFactorOfDisplay).toNearestInt();
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}
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Rectangle<float> Displays::logicalToPhysical (Rectangle<float> rect, const Display* useScaleFactorOfDisplay) const noexcept
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{
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const auto* display = useScaleFactorOfDisplay != nullptr ? useScaleFactorOfDisplay
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: getDisplayForRect (rect.toNearestInt(), false);
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if (display == nullptr)
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return rect;
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auto globalScale = Desktop::getInstance().getGlobalScaleFactor();
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return ((rect.toFloat() - (display->totalArea.getTopLeft().toFloat() * globalScale)) * (display->scale / globalScale))
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+ display->topLeftPhysical.toFloat();
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}
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template <typename ValueType>
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Point<ValueType> Displays::physicalToLogical (Point<ValueType> point, const Display* useScaleFactorOfDisplay) const noexcept
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{
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const auto* display = useScaleFactorOfDisplay != nullptr ? useScaleFactorOfDisplay
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: getDisplayForPoint (point.roundToInt(), true);
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if (display == nullptr)
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return point;
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auto globalScale = Desktop::getInstance().getGlobalScaleFactor();
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Point<ValueType> logicalTopLeft (static_cast<ValueType> (display->totalArea.getX()), static_cast<ValueType> (display->totalArea.getY()));
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Point<ValueType> physicalTopLeft (static_cast<ValueType> (display->topLeftPhysical.getX()), static_cast<ValueType> (display->topLeftPhysical.getY()));
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return ((point - physicalTopLeft) / (display->scale / globalScale)) + (logicalTopLeft * globalScale);
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}
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template <typename ValueType>
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Point<ValueType> Displays::logicalToPhysical (Point<ValueType> point, const Display* useScaleFactorOfDisplay) const noexcept
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{
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const auto* display = useScaleFactorOfDisplay != nullptr ? useScaleFactorOfDisplay
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: getDisplayForPoint (point.roundToInt(), false);
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if (display == nullptr)
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return point;
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auto globalScale = Desktop::getInstance().getGlobalScaleFactor();
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Point<ValueType> logicalTopLeft (static_cast<ValueType> (display->totalArea.getX()), static_cast<ValueType> (display->totalArea.getY()));
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Point<ValueType> physicalTopLeft (static_cast<ValueType> (display->topLeftPhysical.getX()), static_cast<ValueType> (display->topLeftPhysical.getY()));
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return ((point - (logicalTopLeft * globalScale)) * (display->scale / globalScale)) + physicalTopLeft;
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}
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const Displays::Display* Displays::getPrimaryDisplay() const noexcept
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{
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JUCE_ASSERT_MESSAGE_MANAGER_IS_LOCKED
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for (auto& d : displays)
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if (d.isMain)
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return &d;
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return nullptr;
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}
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RectangleList<int> Displays::getRectangleList (bool userAreasOnly) const
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{
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JUCE_ASSERT_MESSAGE_MANAGER_IS_LOCKED
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RectangleList<int> rl;
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for (auto& d : displays)
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rl.addWithoutMerging (userAreasOnly ? d.userArea : d.totalArea);
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return rl;
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}
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Rectangle<int> Displays::getTotalBounds (bool userAreasOnly) const
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{
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return getRectangleList (userAreasOnly).getBounds();
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}
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void Displays::refresh()
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{
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Array<Display> oldDisplays;
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oldDisplays.swapWith (displays);
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init (Desktop::getInstance());
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if (oldDisplays != displays)
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{
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for (auto i = ComponentPeer::getNumPeers(); --i >= 0;)
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if (auto* peer = ComponentPeer::getPeer (i))
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peer->handleScreenSizeChange();
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}
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}
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bool operator== (const Displays::Display& d1, const Displays::Display& d2) noexcept;
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bool operator== (const Displays::Display& d1, const Displays::Display& d2) noexcept
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{
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return d1.isMain == d2.isMain
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&& d1.totalArea == d2.totalArea
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&& d1.userArea == d2.userArea
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&& d1.topLeftPhysical == d2.topLeftPhysical
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&& d1.scale == d2.scale
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&& d1.dpi == d2.dpi;
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}
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bool operator!= (const Displays::Display& d1, const Displays::Display& d2) noexcept;
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bool operator!= (const Displays::Display& d1, const Displays::Display& d2) noexcept { return ! (d1 == d2); }
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//==============================================================================
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// These methods are used for converting the totalArea and userArea Rectangles in Display from physical to logical
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// pixels. We do this by constructing a graph of connected displays where the root node has position (0, 0); this can be
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// safely converted to logical pixels using its scale factor and we can then traverse the graph and work out the logical pixels
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// for all the other connected displays. We need to do this as the logical bounds of a display depend not only on its scale
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// factor but also the scale factor of the displays connected to it.
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/**
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Represents a node in our graph of displays.
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*/
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struct DisplayNode
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{
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/** The Display object that this represents. */
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Displays::Display* display;
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/** True if this represents the 'root' display with position (0, 0). */
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bool isRoot = false;
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/** The parent node of this node in our display graph. This will have a correct logicalArea. */
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DisplayNode* parent = nullptr;
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/** The logical area to be calculated. This will be valid after processDisplay() has
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been called on this node.
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*/
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Rectangle<double> logicalArea;
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};
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/** Recursive - will calculate and set the logicalArea member of current. */
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static void processDisplay (DisplayNode* currentNode, Array<DisplayNode>& allNodes)
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{
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const auto physicalArea = currentNode->display->totalArea.toDouble();
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const auto scale = currentNode->display->scale;
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if (! currentNode->isRoot)
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{
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const auto logicalWidth = physicalArea.getWidth() / scale;
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const auto logicalHeight = physicalArea.getHeight() / scale;
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const auto physicalParentArea = currentNode->parent->display->totalArea.toDouble();
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const auto logicalParentArea = currentNode->parent->logicalArea; // logical area of parent has already been calculated
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const auto parentScale = currentNode->parent->display->scale;
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Rectangle<double> logicalArea (0.0, 0.0, logicalWidth, logicalHeight);
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if (physicalArea.getRight() == physicalParentArea.getX()) logicalArea.setPosition ({ logicalParentArea.getX() - logicalWidth, physicalArea.getY() / parentScale }); // on left
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else if (physicalArea.getX() == physicalParentArea.getRight()) logicalArea.setPosition ({ logicalParentArea.getRight(), physicalArea.getY() / parentScale }); // on right
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else if (physicalArea.getBottom() == physicalParentArea.getY()) logicalArea.setPosition ({ physicalArea.getX() / parentScale, logicalParentArea.getY() - logicalHeight }); // on top
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else if (physicalArea.getY() == physicalParentArea.getBottom()) logicalArea.setPosition ({ physicalArea.getX() / parentScale, logicalParentArea.getBottom() }); // on bottom
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else jassertfalse;
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currentNode->logicalArea = logicalArea;
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}
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else
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{
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// If currentNode is the root (position (0, 0)) then we can just scale the physical area
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currentNode->logicalArea = physicalArea / scale;
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currentNode->parent = currentNode;
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}
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// Find child nodes
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Array<DisplayNode*> children;
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for (auto& node : allNodes)
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{
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// Already calculated
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if (node.parent != nullptr)
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continue;
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const auto otherPhysicalArea = node.display->totalArea.toDouble();
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// If the displays are touching on any side
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if (otherPhysicalArea.getX() == physicalArea.getRight() || otherPhysicalArea.getRight() == physicalArea.getX()
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|| otherPhysicalArea.getY() == physicalArea.getBottom() || otherPhysicalArea.getBottom() == physicalArea.getY())
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{
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node.parent = currentNode;
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children.add (&node);
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}
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}
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// Recursively process all child nodes
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for (auto child : children)
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processDisplay (child, allNodes);
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}
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/** This is called when the displays Array has been filled out with the info for all connected displays and the
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totalArea and userArea Rectangles need to be converted from physical to logical coordinates.
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*/
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void Displays::updateToLogical()
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{
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if (displays.size() == 1)
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{
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auto& display = displays.getReference (0);
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display.totalArea = (display.totalArea.toDouble() / display.scale).toNearestInt();
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display.userArea = (display.userArea.toDouble() / display.scale).toNearestInt();
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return;
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}
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Array<DisplayNode> displayNodes;
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for (auto& d : displays)
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{
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DisplayNode node;
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node.display = &d;
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if (d.totalArea.getTopLeft() == Point<int>())
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node.isRoot = true;
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displayNodes.add (node);
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}
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auto* root = [&displayNodes]() -> DisplayNode*
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{
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for (auto& node : displayNodes)
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if (node.isRoot)
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return &node;
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auto minDistance = std::numeric_limits<int>::max();
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DisplayNode* retVal = nullptr;
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for (auto& node : displayNodes)
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{
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auto distance = node.display->totalArea.getTopLeft().getDistanceFrom ({});
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if (distance < minDistance)
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{
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minDistance = distance;
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retVal = &node;
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}
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}
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if (retVal != nullptr)
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retVal->isRoot = true;
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return retVal;
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}();
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// Must have a root node!
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jassert (root != nullptr);
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// Recursively traverse the display graph from the root and work out logical bounds
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processDisplay (root, displayNodes);
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for (auto& node : displayNodes)
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{
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// All of the nodes should have a parent
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jassert (node.parent != nullptr);
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auto relativeUserArea = (node.display->userArea.toDouble() - node.display->totalArea.toDouble().getTopLeft()) / node.display->scale;
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// Now set Display::totalArea and ::userArea using the logical area that we have calculated
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node.display->topLeftPhysical = node.display->totalArea.getTopLeft();
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node.display->totalArea = node.logicalArea.toNearestInt();
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node.display->userArea = (relativeUserArea + node.logicalArea.getTopLeft()).toNearestInt();
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}
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}
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#ifndef DOXYGEN
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// explicit template instantiations
|
||
|
|
template Point<int> Displays::physicalToLogical (Point<int>, const Display*) const noexcept;
|
||
|
|
template Point<float> Displays::physicalToLogical (Point<float>, const Display*) const noexcept;
|
||
|
|
|
||
|
|
template Point<int> Displays::logicalToPhysical (Point<int>, const Display*) const noexcept;
|
||
|
|
template Point<float> Displays::logicalToPhysical (Point<float>, const Display*) const noexcept;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
//==============================================================================
|
||
|
|
// Deprecated methods
|
||
|
|
const Displays::Display& Displays::getDisplayContaining (Point<int> position) const noexcept
|
||
|
|
{
|
||
|
|
JUCE_ASSERT_MESSAGE_MANAGER_IS_LOCKED
|
||
|
|
const auto* best = &displays.getReference (0);
|
||
|
|
auto bestDistance = std::numeric_limits<int>::max();
|
||
|
|
|
||
|
|
for (auto& d : displays)
|
||
|
|
{
|
||
|
|
if (d.totalArea.contains (position))
|
||
|
|
{
|
||
|
|
best = &d;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
auto distance = d.totalArea.getCentre().getDistanceFrom (position);
|
||
|
|
|
||
|
|
if (distance < bestDistance)
|
||
|
|
{
|
||
|
|
bestDistance = distance;
|
||
|
|
best = &d;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return *best;
|
||
|
|
}
|
||
|
|
|
||
|
|
const Displays::Display& Displays::findDisplayForRect (Rectangle<int> rect, bool isPhysical) const noexcept
|
||
|
|
{
|
||
|
|
if (auto* display = getDisplayForRect (rect, isPhysical))
|
||
|
|
return *display;
|
||
|
|
|
||
|
|
return emptyDisplay;
|
||
|
|
}
|
||
|
|
|
||
|
|
const Displays::Display& Displays::findDisplayForPoint (Point<int> point, bool isPhysical) const noexcept
|
||
|
|
{
|
||
|
|
if (auto* display = getDisplayForPoint (point, isPhysical))
|
||
|
|
return *display;
|
||
|
|
|
||
|
|
return emptyDisplay;
|
||
|
|
}
|
||
|
|
|
||
|
|
const Displays::Display& Displays::getMainDisplay() const noexcept
|
||
|
|
{
|
||
|
|
if (auto* display = getPrimaryDisplay())
|
||
|
|
return *display;
|
||
|
|
|
||
|
|
return emptyDisplay;
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace juce
|