JUCE/extras/Projucer/Source/Utility/UI/jucer_SlidingPanelComponent.cpp

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

   This file is part of the JUCE 6 technical preview.
   Copyright (c) 2017 - ROLI Ltd.

   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.

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

#include "../../Application/jucer_Headers.h"
#include "jucer_SlidingPanelComponent.h"

//==============================================================================
struct SlidingPanelComponent::DotButton  : public Button
{
    DotButton (SlidingPanelComponent& sp, int pageIndex)
        : Button (String()), owner (sp), index (pageIndex) {}

    void paintButton (Graphics& g, bool /*isMouseOverButton*/, bool /*isButtonDown*/) override
    {
        g.setColour (findColour (defaultButtonBackgroundColourId));
        const auto r = getLocalBounds().reduced (getWidth() / 4).toFloat();

        if (index == owner.getCurrentTabIndex())
            g.fillEllipse (r);
        else
            g.drawEllipse (r, 1.0f);
    }

    void clicked() override
    {
        owner.goToTab (index);
    }

    using Button::clicked;

    SlidingPanelComponent& owner;
    int index;
};

//==============================================================================
SlidingPanelComponent::SlidingPanelComponent()
    : currentIndex (0), dotSize (20)
{
    addAndMakeVisible (pageHolder);
}

SlidingPanelComponent::~SlidingPanelComponent()
{
}

SlidingPanelComponent::PageInfo::~PageInfo()
{
    if (shouldDelete)
        content.deleteAndZero();
}

void SlidingPanelComponent::addTab (const String& tabName,
                                    Component* const contentComponent,
                                    const bool deleteComponentWhenNotNeeded,
                                    const int insertIndex)
{
    PageInfo* page = new PageInfo();
    pages.insert (insertIndex, page);
    page->content = contentComponent;
    page->dotButton.reset (new DotButton (*this, pages.indexOf (page)));
    addAndMakeVisible (page->dotButton.get());
    page->name = tabName;
    page->shouldDelete = deleteComponentWhenNotNeeded;

    pageHolder.addAndMakeVisible (contentComponent);
    resized();
}

void SlidingPanelComponent::goToTab (int targetTabIndex)
{
    currentIndex = targetTabIndex;

    Desktop::getInstance().getAnimator()
        .animateComponent (&pageHolder, pageHolder.getBounds().withX (-targetTabIndex * getWidth()),
                           1.0f, 600, false, 0.0, 0.0);

    repaint();
}

void SlidingPanelComponent::resized()
{
    pageHolder.setBounds (-currentIndex * getWidth(), pageHolder.getPosition().y,
                          getNumTabs() * getWidth(), getHeight());

    Rectangle<int> content (getLocalBounds());

    Rectangle<int> dotHolder = content.removeFromBottom (20 + dotSize)
                                 .reduced ((content.getWidth() - dotSize * getNumTabs()) / 2, 10);

    for (int i = 0; i < getNumTabs(); ++i)
        pages.getUnchecked(i)->dotButton->setBounds (dotHolder.removeFromLeft (dotSize));

    for (int i = pages.size(); --i >= 0;)
        if (Component* c = pages.getUnchecked(i)->content)
            c->setBounds (content.translated (i * content.getWidth(), 0));
}