Carla/source/modules/juce_gui_basics/misc/juce_BubbleComponent.cpp

/*
  ==============================================================================

   This file is part of the JUCE 6 technical preview.
   Copyright (c) 2020 - Raw Material Software Limited

   You may use this code under the terms of the GPL v3
   (see www.gnu.org/licenses).

   For this technical preview, this file is not subject to commercial licensing.

   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
{

BubbleComponent::BubbleComponent()
  : allowablePlacements (above | below | left | right)
{
    setInterceptsMouseClicks (false, false);

    shadow.setShadowProperties (DropShadow (Colours::black.withAlpha (0.35f), 5, Point<int>()));
    setComponentEffect (&shadow);
}

BubbleComponent::~BubbleComponent() {}

//==============================================================================
void BubbleComponent::paint (Graphics& g)
{
    getLookAndFeel().drawBubble (g, *this, arrowTip.toFloat(), content.toFloat());

    g.reduceClipRegion (content);
    g.setOrigin (content.getPosition());

    paintContent (g, content.getWidth(), content.getHeight());
}

void BubbleComponent::setAllowedPlacement (const int newPlacement)
{
    allowablePlacements = newPlacement;
}

//==============================================================================
void BubbleComponent::setPosition (Component* componentToPointTo, int distanceFromTarget, int arrowLength)
{
    jassert (componentToPointTo != nullptr);

    Rectangle<int> target;

    if (Component* p = getParentComponent())
        target = p->getLocalArea (componentToPointTo, componentToPointTo->getLocalBounds());
    else
        target = componentToPointTo->getScreenBounds().transformedBy (getTransform().inverted());

    setPosition (target, distanceFromTarget, arrowLength);
}

void BubbleComponent::setPosition (Point<int> arrowTipPos, int arrowLength)
{
    setPosition (Rectangle<int> (arrowTipPos.x, arrowTipPos.y, 1, 1), arrowLength, arrowLength);
}

void BubbleComponent::setPosition (Rectangle<int> rectangleToPointTo,
                                   int distanceFromTarget, int arrowLength)
{
    {
        int contentW = 150, contentH = 30;
        getContentSize (contentW, contentH);
        content.setBounds (distanceFromTarget, distanceFromTarget, contentW, contentH);
    }

    const int totalW = content.getWidth()  + distanceFromTarget * 2;
    const int totalH = content.getHeight() + distanceFromTarget * 2;

    auto availableSpace = (getParentComponent() != nullptr ? getParentComponent()->getLocalBounds()
                                                           : getParentMonitorArea().transformedBy (getTransform().inverted()));

    int spaceAbove = ((allowablePlacements & above) != 0) ? jmax (0, rectangleToPointTo.getY()  - availableSpace.getY()) : -1;
    int spaceBelow = ((allowablePlacements & below) != 0) ? jmax (0, availableSpace.getBottom() - rectangleToPointTo.getBottom()) : -1;
    int spaceLeft  = ((allowablePlacements & left)  != 0) ? jmax (0, rectangleToPointTo.getX()  - availableSpace.getX()) : -1;
    int spaceRight = ((allowablePlacements & right) != 0) ? jmax (0, availableSpace.getRight()  - rectangleToPointTo.getRight()) : -1;

    // look at whether the component is elongated, and if so, try to position next to its longer dimension.
    if (rectangleToPointTo.getWidth() > rectangleToPointTo.getHeight() * 2
         && (spaceAbove > totalH + 20 || spaceBelow > totalH + 20))
    {
        spaceLeft = spaceRight = 0;
    }
    else if (rectangleToPointTo.getWidth() < rectangleToPointTo.getHeight() / 2
              && (spaceLeft > totalW + 20 || spaceRight > totalW + 20))
    {
        spaceAbove = spaceBelow = 0;
    }

    int targetX, targetY;

    if (jmax (spaceAbove, spaceBelow) >= jmax (spaceLeft, spaceRight))
    {
        targetX = rectangleToPointTo.getCentre().x;
        arrowTip.x = totalW / 2;

        if (spaceAbove >= spaceBelow)
        {
            // above
            targetY = rectangleToPointTo.getY();
            arrowTip.y = content.getBottom() + arrowLength;
        }
        else
        {
            // below
            targetY = rectangleToPointTo.getBottom();
            arrowTip.y = content.getY() - arrowLength;
        }
    }
    else
    {
        targetY = rectangleToPointTo.getCentre().y;
        arrowTip.y = totalH / 2;

        if (spaceLeft > spaceRight)
        {
            // on the left
            targetX = rectangleToPointTo.getX();
            arrowTip.x = content.getRight() + arrowLength;
        }
        else
        {
            // on the right
            targetX = rectangleToPointTo.getRight();
            arrowTip.x = content.getX() - arrowLength;
        }
    }

    setBounds (targetX - arrowTip.x, targetY - arrowTip.y, totalW, totalH);
}

} // namespace juce