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428 lines
13 KiB
428 lines
13 KiB
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2015 - ROLI Ltd.
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Permission is granted to use this software under the terms of either:
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a) the GPL v2 (or any later version)
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b) the Affero GPL v3
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Details of these licenses can be found at: www.gnu.org/licenses
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JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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------------------------------------------------------------------------------
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To release a closed-source product which uses JUCE, commercial licenses are
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available: visit www.juce.com for more information.
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==============================================================================
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*/
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class ScrollBar::ScrollbarButton : public Button
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{
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public:
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ScrollbarButton (const int direction_, ScrollBar& owner_)
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: Button (String::empty), direction (direction_), owner (owner_)
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{
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setWantsKeyboardFocus (false);
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}
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void paintButton (Graphics& g, bool over, bool down) override
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{
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getLookAndFeel().drawScrollbarButton (g, owner, getWidth(), getHeight(),
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direction, owner.isVertical(), over, down);
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}
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void clicked() override
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{
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owner.moveScrollbarInSteps ((direction == 1 || direction == 2) ? 1 : -1);
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}
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int direction;
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private:
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ScrollBar& owner;
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JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ScrollbarButton)
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};
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//==============================================================================
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ScrollBar::ScrollBar (const bool vertical_)
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: totalRange (0.0, 1.0),
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visibleRange (0.0, 0.1),
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singleStepSize (0.1),
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thumbAreaStart (0),
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thumbAreaSize (0),
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thumbStart (0),
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thumbSize (0),
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minimumScrollBarThumbSize (0),
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initialDelayInMillisecs (100),
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repeatDelayInMillisecs (50),
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minimumDelayInMillisecs (10),
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vertical (vertical_),
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isDraggingThumb (false),
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autohides (true)
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{
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minimumScrollBarThumbSize = getLookAndFeel().getMinimumScrollbarThumbSize (*this);
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setRepaintsOnMouseActivity (true);
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setFocusContainer (true);
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}
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ScrollBar::~ScrollBar()
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{
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upButton = nullptr;
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downButton = nullptr;
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}
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//==============================================================================
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void ScrollBar::setRangeLimits (Range<double> newRangeLimit, NotificationType notification)
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{
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if (totalRange != newRangeLimit)
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{
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totalRange = newRangeLimit;
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setCurrentRange (visibleRange, notification);
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updateThumbPosition();
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}
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}
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void ScrollBar::setRangeLimits (const double newMinimum, const double newMaximum, NotificationType notification)
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{
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jassert (newMaximum >= newMinimum); // these can't be the wrong way round!
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setRangeLimits (Range<double> (newMinimum, newMaximum), notification);
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}
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bool ScrollBar::setCurrentRange (Range<double> newRange,
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const NotificationType notification)
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{
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const Range<double> constrainedRange (totalRange.constrainRange (newRange));
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if (visibleRange != constrainedRange)
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{
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visibleRange = constrainedRange;
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updateThumbPosition();
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if (notification != dontSendNotification)
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triggerAsyncUpdate();
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if (notification == sendNotificationSync)
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handleUpdateNowIfNeeded();
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return true;
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}
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return false;
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}
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void ScrollBar::setCurrentRange (const double newStart, const double newSize, NotificationType notification)
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{
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setCurrentRange (Range<double> (newStart, newStart + newSize), notification);
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}
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void ScrollBar::setCurrentRangeStart (const double newStart, NotificationType notification)
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{
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setCurrentRange (visibleRange.movedToStartAt (newStart), notification);
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}
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void ScrollBar::setSingleStepSize (const double newSingleStepSize) noexcept
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{
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singleStepSize = newSingleStepSize;
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}
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bool ScrollBar::moveScrollbarInSteps (const int howManySteps, NotificationType notification)
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{
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return setCurrentRange (visibleRange + howManySteps * singleStepSize, notification);
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}
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bool ScrollBar::moveScrollbarInPages (const int howManyPages, NotificationType notification)
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{
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return setCurrentRange (visibleRange + howManyPages * visibleRange.getLength(), notification);
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}
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bool ScrollBar::scrollToTop (NotificationType notification)
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{
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return setCurrentRange (visibleRange.movedToStartAt (getMinimumRangeLimit()), notification);
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}
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bool ScrollBar::scrollToBottom (NotificationType notification)
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{
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return setCurrentRange (visibleRange.movedToEndAt (getMaximumRangeLimit()), notification);
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}
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void ScrollBar::setButtonRepeatSpeed (const int initialDelayInMillisecs_,
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const int repeatDelayInMillisecs_,
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const int minimumDelayInMillisecs_)
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{
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initialDelayInMillisecs = initialDelayInMillisecs_;
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repeatDelayInMillisecs = repeatDelayInMillisecs_;
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minimumDelayInMillisecs = minimumDelayInMillisecs_;
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if (upButton != nullptr)
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{
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upButton ->setRepeatSpeed (initialDelayInMillisecs, repeatDelayInMillisecs, minimumDelayInMillisecs);
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downButton->setRepeatSpeed (initialDelayInMillisecs, repeatDelayInMillisecs, minimumDelayInMillisecs);
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}
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}
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//==============================================================================
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void ScrollBar::addListener (Listener* const listener)
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{
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listeners.add (listener);
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}
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void ScrollBar::removeListener (Listener* const listener)
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{
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listeners.remove (listener);
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}
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void ScrollBar::handleAsyncUpdate()
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{
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double start = visibleRange.getStart(); // (need to use a temp variable for VC7 compatibility)
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listeners.call (&ScrollBar::Listener::scrollBarMoved, this, start);
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}
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//==============================================================================
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void ScrollBar::updateThumbPosition()
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{
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int newThumbSize = roundToInt (totalRange.getLength() > 0 ? (visibleRange.getLength() * thumbAreaSize) / totalRange.getLength()
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: thumbAreaSize);
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if (newThumbSize < minimumScrollBarThumbSize)
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newThumbSize = jmin (minimumScrollBarThumbSize, thumbAreaSize - 1);
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if (newThumbSize > thumbAreaSize)
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newThumbSize = thumbAreaSize;
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int newThumbStart = thumbAreaStart;
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if (totalRange.getLength() > visibleRange.getLength())
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newThumbStart += roundToInt (((visibleRange.getStart() - totalRange.getStart()) * (thumbAreaSize - newThumbSize))
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/ (totalRange.getLength() - visibleRange.getLength()));
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setVisible ((! autohides) || (totalRange.getLength() > visibleRange.getLength() && visibleRange.getLength() > 0.0));
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if (thumbStart != newThumbStart || thumbSize != newThumbSize)
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{
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const int repaintStart = jmin (thumbStart, newThumbStart) - 4;
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const int repaintSize = jmax (thumbStart + thumbSize, newThumbStart + newThumbSize) + 8 - repaintStart;
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if (vertical)
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repaint (0, repaintStart, getWidth(), repaintSize);
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else
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repaint (repaintStart, 0, repaintSize, getHeight());
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thumbStart = newThumbStart;
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thumbSize = newThumbSize;
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}
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}
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void ScrollBar::setOrientation (const bool shouldBeVertical)
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{
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if (vertical != shouldBeVertical)
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{
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vertical = shouldBeVertical;
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if (upButton != nullptr)
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{
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upButton->direction = vertical ? 0 : 3;
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downButton->direction = vertical ? 2 : 1;
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}
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updateThumbPosition();
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}
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}
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void ScrollBar::setAutoHide (const bool shouldHideWhenFullRange)
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{
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autohides = shouldHideWhenFullRange;
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updateThumbPosition();
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}
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bool ScrollBar::autoHides() const noexcept
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{
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return autohides;
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}
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//==============================================================================
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void ScrollBar::paint (Graphics& g)
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{
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if (thumbAreaSize > 0)
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{
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LookAndFeel& lf = getLookAndFeel();
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const int thumb = (thumbAreaSize > lf.getMinimumScrollbarThumbSize (*this))
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? thumbSize : 0;
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if (vertical)
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lf.drawScrollbar (g, *this, 0, thumbAreaStart, getWidth(), thumbAreaSize,
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vertical, thumbStart, thumb, isMouseOver(), isMouseButtonDown());
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else
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lf.drawScrollbar (g, *this, thumbAreaStart, 0, thumbAreaSize, getHeight(),
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vertical, thumbStart, thumb, isMouseOver(), isMouseButtonDown());
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}
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}
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void ScrollBar::lookAndFeelChanged()
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{
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setComponentEffect (getLookAndFeel().getScrollbarEffect());
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if (isVisible())
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resized();
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}
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void ScrollBar::resized()
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{
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const int length = vertical ? getHeight() : getWidth();
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LookAndFeel& lf = getLookAndFeel();
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minimumScrollBarThumbSize = lf.getMinimumScrollbarThumbSize (*this);
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const bool buttonsVisible = lf.areScrollbarButtonsVisible();
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int buttonSize = 0;
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if (buttonsVisible)
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{
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if (upButton == nullptr)
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{
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addAndMakeVisible (upButton = new ScrollbarButton (vertical ? 0 : 3, *this));
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addAndMakeVisible (downButton = new ScrollbarButton (vertical ? 2 : 1, *this));
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setButtonRepeatSpeed (initialDelayInMillisecs, repeatDelayInMillisecs, minimumDelayInMillisecs);
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}
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buttonSize = jmin (lf.getScrollbarButtonSize (*this), length / 2);
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}
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else
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{
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upButton = nullptr;
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downButton = nullptr;
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}
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if (length < 32 + lf.getMinimumScrollbarThumbSize (*this))
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{
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thumbAreaStart = length / 2;
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thumbAreaSize = 0;
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}
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else
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{
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thumbAreaStart = buttonSize;
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thumbAreaSize = length - (buttonSize << 1);
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}
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if (upButton != nullptr)
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{
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if (vertical)
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{
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upButton->setBounds (0, 0, getWidth(), buttonSize);
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downButton->setBounds (0, thumbAreaStart + thumbAreaSize, getWidth(), buttonSize);
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}
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else
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{
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upButton->setBounds (0, 0, buttonSize, getHeight());
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downButton->setBounds (thumbAreaStart + thumbAreaSize, 0, buttonSize, getHeight());
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}
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}
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updateThumbPosition();
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}
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void ScrollBar::parentHierarchyChanged()
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{
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lookAndFeelChanged();
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}
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void ScrollBar::mouseDown (const MouseEvent& e)
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{
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isDraggingThumb = false;
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lastMousePos = vertical ? e.y : e.x;
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dragStartMousePos = lastMousePos;
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dragStartRange = visibleRange.getStart();
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if (dragStartMousePos < thumbStart)
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{
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moveScrollbarInPages (-1);
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startTimer (400);
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}
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else if (dragStartMousePos >= thumbStart + thumbSize)
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{
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moveScrollbarInPages (1);
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startTimer (400);
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}
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else
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{
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isDraggingThumb = (thumbAreaSize > getLookAndFeel().getMinimumScrollbarThumbSize (*this))
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&& (thumbAreaSize > thumbSize);
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}
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}
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void ScrollBar::mouseDrag (const MouseEvent& e)
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{
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const int mousePos = vertical ? e.y : e.x;
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if (isDraggingThumb && lastMousePos != mousePos && thumbAreaSize > thumbSize)
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{
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const int deltaPixels = mousePos - dragStartMousePos;
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setCurrentRangeStart (dragStartRange
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+ deltaPixels * (totalRange.getLength() - visibleRange.getLength())
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/ (thumbAreaSize - thumbSize));
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}
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lastMousePos = mousePos;
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}
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void ScrollBar::mouseUp (const MouseEvent&)
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{
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isDraggingThumb = false;
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stopTimer();
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repaint();
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}
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void ScrollBar::mouseWheelMove (const MouseEvent&, const MouseWheelDetails& wheel)
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{
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float increment = 10.0f * (vertical ? wheel.deltaY : wheel.deltaX);
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if (increment < 0)
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increment = jmin (increment, -1.0f);
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else if (increment > 0)
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increment = jmax (increment, 1.0f);
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setCurrentRange (visibleRange - singleStepSize * increment);
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}
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void ScrollBar::timerCallback()
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{
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if (isMouseButtonDown())
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{
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startTimer (40);
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if (lastMousePos < thumbStart)
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setCurrentRange (visibleRange - visibleRange.getLength());
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else if (lastMousePos > thumbStart + thumbSize)
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setCurrentRangeStart (visibleRange.getEnd());
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}
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else
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{
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stopTimer();
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}
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}
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bool ScrollBar::keyPressed (const KeyPress& key)
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{
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if (isVisible())
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{
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if (key == KeyPress::upKey || key == KeyPress::leftKey) return moveScrollbarInSteps (-1);
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if (key == KeyPress::downKey || key == KeyPress::rightKey) return moveScrollbarInSteps (1);
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if (key == KeyPress::pageUpKey) return moveScrollbarInPages (-1);
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if (key == KeyPress::pageDownKey) return moveScrollbarInPages (1);
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if (key == KeyPress::homeKey) return scrollToTop();
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if (key == KeyPress::endKey) return scrollToBottom();
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}
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return false;
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}
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