mirror of
https://github.com/juce-framework/JUCE.git
synced 2026-01-10 23:44:24 +00:00
452 lines
14 KiB
C++
452 lines
14 KiB
C++
/*
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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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constexpr uint8 whiteNotes[] = { 0, 2, 4, 5, 7, 9, 11 };
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constexpr uint8 blackNotes[] = { 1, 3, 6, 8, 10 };
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//==============================================================================
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struct KeyboardComponentBase::UpDownButton : public Button
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{
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UpDownButton (KeyboardComponentBase& c, int d)
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: Button ({}), owner (c), delta (d)
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{
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}
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void clicked() override
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{
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auto note = owner.getLowestVisibleKey();
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note = delta < 0 ? (note - 1) / 12 : note / 12 + 1;
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owner.setLowestVisibleKey (note * 12);
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}
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using Button::clicked;
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void paintButton (Graphics& g, bool shouldDrawButtonAsHighlighted, bool shouldDrawButtonAsDown) override
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{
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owner.drawUpDownButton (g, getWidth(), getHeight(),
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shouldDrawButtonAsHighlighted, shouldDrawButtonAsDown,
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delta > 0);
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}
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private:
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KeyboardComponentBase& owner;
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int delta;
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JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (UpDownButton)
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};
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//==============================================================================
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KeyboardComponentBase::KeyboardComponentBase (Orientation o) : orientation (o)
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{
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scrollDown = std::make_unique<UpDownButton> (*this, -1);
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scrollUp = std::make_unique<UpDownButton> (*this, 1);
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addChildComponent (*scrollDown);
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addChildComponent (*scrollUp);
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colourChanged();
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}
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//==============================================================================
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void KeyboardComponentBase::setKeyWidth (float widthInPixels)
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{
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jassert (widthInPixels > 0);
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if (keyWidth != widthInPixels) // Prevent infinite recursion if the width is being computed in a 'resized()' callback
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{
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keyWidth = widthInPixels;
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resized();
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}
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}
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void KeyboardComponentBase::setScrollButtonWidth (int widthInPixels)
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{
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jassert (widthInPixels > 0);
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if (scrollButtonWidth != widthInPixels)
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{
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scrollButtonWidth = widthInPixels;
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resized();
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}
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}
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void KeyboardComponentBase::setOrientation (Orientation newOrientation)
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{
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if (orientation != newOrientation)
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{
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orientation = newOrientation;
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resized();
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}
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}
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void KeyboardComponentBase::setAvailableRange (int lowestNote, int highestNote)
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{
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jassert (lowestNote >= 0 && lowestNote <= 127);
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jassert (highestNote >= 0 && highestNote <= 127);
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jassert (lowestNote <= highestNote);
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if (rangeStart != lowestNote || rangeEnd != highestNote)
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{
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rangeStart = jlimit (0, 127, lowestNote);
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rangeEnd = jlimit (0, 127, highestNote);
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firstKey = jlimit ((float) rangeStart, (float) rangeEnd, firstKey);
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resized();
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}
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}
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void KeyboardComponentBase::setLowestVisibleKey (int noteNumber)
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{
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setLowestVisibleKeyFloat ((float) noteNumber);
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}
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void KeyboardComponentBase::setLowestVisibleKeyFloat (float noteNumber)
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{
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noteNumber = jlimit ((float) rangeStart, (float) rangeEnd, noteNumber);
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if (noteNumber != firstKey)
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{
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bool hasMoved = (((int) firstKey) != (int) noteNumber);
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firstKey = noteNumber;
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if (hasMoved)
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sendChangeMessage();
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resized();
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}
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}
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float KeyboardComponentBase::getWhiteNoteLength() const noexcept
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{
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return (orientation == horizontalKeyboard) ? (float) getHeight() : (float) getWidth();
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}
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void KeyboardComponentBase::setBlackNoteLengthProportion (float ratio) noexcept
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{
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jassert (ratio >= 0.0f && ratio <= 1.0f);
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if (blackNoteLengthRatio != ratio)
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{
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blackNoteLengthRatio = ratio;
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resized();
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}
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}
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float KeyboardComponentBase::getBlackNoteLength() const noexcept
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{
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auto whiteNoteLength = orientation == horizontalKeyboard ? getHeight() : getWidth();
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return (float) whiteNoteLength * blackNoteLengthRatio;
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}
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void KeyboardComponentBase::setBlackNoteWidthProportion (float ratio) noexcept
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{
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jassert (ratio >= 0.0f && ratio <= 1.0f);
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if (blackNoteWidthRatio != ratio)
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{
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blackNoteWidthRatio = ratio;
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resized();
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}
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}
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void KeyboardComponentBase::setScrollButtonsVisible (bool newCanScroll)
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{
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if (canScroll != newCanScroll)
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{
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canScroll = newCanScroll;
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resized();
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}
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}
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//==============================================================================
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Range<float> KeyboardComponentBase::getKeyPos (int midiNoteNumber) const
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{
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return getKeyPosition (midiNoteNumber, keyWidth)
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- xOffset
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- getKeyPosition (rangeStart, keyWidth).getStart();
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}
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float KeyboardComponentBase::getKeyStartPosition (int midiNoteNumber) const
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{
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return getKeyPos (midiNoteNumber).getStart();
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}
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float KeyboardComponentBase::getTotalKeyboardWidth() const noexcept
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{
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return getKeyPos (rangeEnd).getEnd();
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}
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KeyboardComponentBase::NoteAndVelocity KeyboardComponentBase::getNoteAndVelocityAtPosition (Point<float> pos, bool children)
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{
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if (! reallyContains (pos, children))
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return { -1, 0.0f };
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auto p = pos;
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if (orientation != horizontalKeyboard)
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{
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p = { p.y, p.x };
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if (orientation == verticalKeyboardFacingLeft)
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p = { p.x, (float) getWidth() - p.y };
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else
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p = { (float) getHeight() - p.x, p.y };
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}
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return remappedXYToNote (p + Point<float> (xOffset, 0));
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}
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KeyboardComponentBase::NoteAndVelocity KeyboardComponentBase::remappedXYToNote (Point<float> pos) const
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{
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auto blackNoteLength = getBlackNoteLength();
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if (pos.getY() < blackNoteLength)
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{
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for (int octaveStart = 12 * (rangeStart / 12); octaveStart <= rangeEnd; octaveStart += 12)
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{
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for (int i = 0; i < 5; ++i)
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{
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auto note = octaveStart + blackNotes[i];
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if (rangeStart <= note && note <= rangeEnd)
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{
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if (getKeyPos (note).contains (pos.x - xOffset))
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{
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return { note, jmax (0.0f, pos.y / blackNoteLength) };
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}
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}
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}
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}
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}
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for (int octaveStart = 12 * (rangeStart / 12); octaveStart <= rangeEnd; octaveStart += 12)
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{
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for (int i = 0; i < 7; ++i)
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{
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auto note = octaveStart + whiteNotes[i];
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if (note >= rangeStart && note <= rangeEnd)
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{
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if (getKeyPos (note).contains (pos.x - xOffset))
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{
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auto whiteNoteLength = (orientation == horizontalKeyboard) ? getHeight() : getWidth();
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return { note, jmax (0.0f, pos.y / (float) whiteNoteLength) };
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}
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}
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}
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}
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return { -1, 0 };
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}
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Rectangle<float> KeyboardComponentBase::getRectangleForKey (int note) const
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{
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jassert (note >= rangeStart && note <= rangeEnd);
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auto pos = getKeyPos (note);
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auto x = pos.getStart();
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auto w = pos.getLength();
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if (MidiMessage::isMidiNoteBlack (note))
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{
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auto blackNoteLength = getBlackNoteLength();
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switch (orientation)
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{
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case horizontalKeyboard: return { x, 0, w, blackNoteLength };
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case verticalKeyboardFacingLeft: return { (float) getWidth() - blackNoteLength, x, blackNoteLength, w };
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case verticalKeyboardFacingRight: return { 0, (float) getHeight() - x - w, blackNoteLength, w };
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default: jassertfalse; break;
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}
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}
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else
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{
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switch (orientation)
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{
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case horizontalKeyboard: return { x, 0, w, (float) getHeight() };
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case verticalKeyboardFacingLeft: return { 0, x, (float) getWidth(), w };
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case verticalKeyboardFacingRight: return { 0, (float) getHeight() - x - w, (float) getWidth(), w };
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default: jassertfalse; break;
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}
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}
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return {};
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}
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//==============================================================================
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void KeyboardComponentBase::setOctaveForMiddleC (int octaveNum)
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{
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octaveNumForMiddleC = octaveNum;
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repaint();
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}
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//==============================================================================
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void KeyboardComponentBase::drawUpDownButton (Graphics& g, int w, int h, bool mouseOver, bool buttonDown, bool movesOctavesUp)
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{
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g.fillAll (findColour (upDownButtonBackgroundColourId));
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float angle = 0;
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switch (getOrientation())
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{
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case horizontalKeyboard: angle = movesOctavesUp ? 0.0f : 0.5f; break;
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case verticalKeyboardFacingLeft: angle = movesOctavesUp ? 0.25f : 0.75f; break;
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case verticalKeyboardFacingRight: angle = movesOctavesUp ? 0.75f : 0.25f; break;
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default: jassertfalse; break;
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}
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Path path;
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path.addTriangle (0.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.5f);
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path.applyTransform (AffineTransform::rotation (MathConstants<float>::twoPi * angle, 0.5f, 0.5f));
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g.setColour (findColour (upDownButtonArrowColourId)
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.withAlpha (buttonDown ? 1.0f : (mouseOver ? 0.6f : 0.4f)));
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g.fillPath (path, path.getTransformToScaleToFit (1.0f, 1.0f, (float) w - 2.0f, (float) h - 2.0f, true));
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}
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Range<float> KeyboardComponentBase::getKeyPosition (int midiNoteNumber, float targetKeyWidth) const
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{
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auto ratio = getBlackNoteWidthProportion();
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static const float notePos[] = { 0.0f, 1 - ratio * 0.6f,
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1.0f, 2 - ratio * 0.4f,
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2.0f,
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3.0f, 4 - ratio * 0.7f,
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4.0f, 5 - ratio * 0.5f,
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5.0f, 6 - ratio * 0.3f,
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6.0f };
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auto octave = midiNoteNumber / 12;
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auto note = midiNoteNumber % 12;
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auto start = (float) octave * 7.0f * targetKeyWidth + notePos[note] * targetKeyWidth;
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auto width = MidiMessage::isMidiNoteBlack (note) ? blackNoteWidthRatio * targetKeyWidth : targetKeyWidth;
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return { start, start + width };
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}
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//==============================================================================
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void KeyboardComponentBase::paint (Graphics& g)
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{
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drawKeyboardBackground (g, getLocalBounds().toFloat());
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for (int octaveBase = 0; octaveBase < 128; octaveBase += 12)
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{
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for (auto noteNum : whiteNotes)
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drawWhiteKey (octaveBase + noteNum, g, getRectangleForKey (octaveBase + noteNum));
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for (auto noteNum : blackNotes)
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drawBlackKey (octaveBase + noteNum, g, getRectangleForKey (octaveBase + noteNum));
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}
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}
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void KeyboardComponentBase::resized()
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{
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auto w = getWidth();
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auto h = getHeight();
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if (w > 0 && h > 0)
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{
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if (orientation != horizontalKeyboard)
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std::swap (w, h);
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auto kx2 = getKeyPos (rangeEnd).getEnd();
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if ((int) firstKey != rangeStart)
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{
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auto kx1 = getKeyPos (rangeStart).getStart();
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if (kx2 - kx1 <= (float) w)
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{
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firstKey = (float) rangeStart;
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sendChangeMessage();
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repaint();
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}
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}
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scrollDown->setVisible (canScroll && firstKey > (float) rangeStart);
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xOffset = 0;
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if (canScroll)
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{
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auto scrollButtonW = jmin (scrollButtonWidth, w / 2);
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auto r = getLocalBounds();
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if (orientation == horizontalKeyboard)
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{
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scrollDown->setBounds (r.removeFromLeft (scrollButtonW));
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scrollUp ->setBounds (r.removeFromRight (scrollButtonW));
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}
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else if (orientation == verticalKeyboardFacingLeft)
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{
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scrollDown->setBounds (r.removeFromTop (scrollButtonW));
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scrollUp ->setBounds (r.removeFromBottom (scrollButtonW));
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}
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else
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{
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scrollDown->setBounds (r.removeFromBottom (scrollButtonW));
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scrollUp ->setBounds (r.removeFromTop (scrollButtonW));
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}
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auto endOfLastKey = getKeyPos (rangeEnd).getEnd();
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auto spaceAvailable = w;
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auto lastStartKey = remappedXYToNote ({ endOfLastKey - (float) spaceAvailable, 0 }).note + 1;
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if (lastStartKey >= 0 && ((int) firstKey) > lastStartKey)
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{
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firstKey = (float) jlimit (rangeStart, rangeEnd, lastStartKey);
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sendChangeMessage();
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}
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xOffset = getKeyPos ((int) firstKey).getStart();
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}
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else
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{
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firstKey = (float) rangeStart;
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}
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scrollUp->setVisible (canScroll && getKeyPos (rangeEnd).getStart() > (float) w);
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repaint();
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}
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}
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//==============================================================================
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void KeyboardComponentBase::mouseWheelMove (const MouseEvent&, const MouseWheelDetails& wheel)
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{
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auto amount = (orientation == horizontalKeyboard && wheel.deltaX != 0)
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? wheel.deltaX : (orientation == verticalKeyboardFacingLeft ? wheel.deltaY
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: -wheel.deltaY);
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setLowestVisibleKeyFloat (firstKey - amount * keyWidth);
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}
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} // namespace juce
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