Carla/source/frontend/notes-ui

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

# Carla Native Plugins
# Copyright (C) 2012-2019 Filipe Coelho <falktx@falktx.com>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of
# the License, or any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# For a full copy of the GNU General Public License see the doc/GPL.txt file.

# ------------------------------------------------------------------------------------------------------------
# Imports (Global)

from PyQt5.QtCore import pyqtSlot, Qt
from PyQt5.QtWidgets import QGridLayout, QLabel, QPushButton, QTextEdit, QWidget

# -----------------------------------------------------------------------
# Imports (Custom)

from carla_shared import *
from carla_utils import *

# -----------------------------------------------------------------------
# Imports (ExternalUI)

from carla_app import CarlaApplication
from externalui import ExternalUI
from widgets.paramspinbox import ParamSpinBox

# -----------------------------------------------------------------------
# External UI

class DistrhoUINotes(ExternalUI, QWidget):
    def __init__(self):
        ExternalUI.__init__(self)
        QWidget.__init__(self, None)

        self.fCurPage = 1
        self.fSaveSizeNowChecker = -1
        self.fSaveTextNowChecker = -1
        self.fNotes = ["" for x in range(100)]

        self.fTextEdit    = QTextEdit(self)
        self.fButton      = QPushButton(self)
        self.fProgressBar = ParamSpinBox(self)
        self.fSpacer      = QLabel(self)
        self.fGridLayout  = QGridLayout(self)

        self.fButton.setCheckable(True)
        self.fButton.setChecked(True)
        self.fButton.setText("Edit")
        self.fButton.setFixedSize(self.fButton.minimumSizeHint())

        self.fProgressBar.setMinimum(1.0)
        self.fProgressBar.setMaximum(100.0)
        self.fProgressBar.setValue(1.0)
        self.fProgressBar.setStep(1.0)
        self.fProgressBar.setStepSmall(1.0)
        self.fProgressBar.setStepLarge(10.0)

        self.fSpacer.setText("")
        self.fSpacer.setFixedSize(5, 5)

        self.fTextEdit.setReadOnly(False)

        self.setLayout(self.fGridLayout)
        self.fGridLayout.addWidget(self.fTextEdit, 0, 0, 1, 3)
        self.fGridLayout.addWidget(self.fButton, 1, 0, 1, 1)
        self.fGridLayout.addWidget(self.fProgressBar, 1, 1, 1, 1)
        self.fGridLayout.addWidget(self.fSpacer, 1, 2, 1, 1)
        self.fGridLayout.setContentsMargins(0, 0, 0, 0)

        self.fButton.clicked.connect(self.slot_buttonClicked)
        self.fProgressBar.valueChanged.connect(self.slot_progressBarValueChanged)
        self.fTextEdit.textChanged.connect(self.slot_textChanged)

        self.fIdleTimer = self.startTimer(50)

        self.resize(300, 200)
        self.setWindowTitle(self.fUiName)
        self.ready()

    def saveCurrentTextState(self):
        pageKey   = "pageText #%i" % self.fCurPage
        pageValue = self.fTextEdit.toPlainText()

        if pageValue != self.fNotes[self.fCurPage-1]:
            self.fNotes[self.fCurPage-1] = pageValue
            self.sendConfigure(pageKey, pageValue)

    # -------------------------------------------------------------------

    @pyqtSlot(bool)
    def slot_buttonClicked(self, click):
        readOnly = not click
        self.fTextEdit.setReadOnly(readOnly)
        self.sendConfigure("readOnly", "yes" if readOnly else "no")

    @pyqtSlot(float)
    def slot_progressBarValueChanged(self, value):
        ivalue = int(value)
        value  = float(ivalue)

        if self.fCurPage == ivalue:
            return

        # maybe save current text before changing page
        if self.fSaveTextNowChecker >= 0 and value >= 1.0 and value <= 100.0:
            self.saveCurrentTextState()
            self.fSaveTextNowChecker = -1

        # change current page
        self.dspParameterChanged(0, value)

        # tell host about this change
        self.sendControl(0, value)

    @pyqtSlot()
    def slot_textChanged(self):
        self.fSaveTextNowChecker = 0

    # -------------------------------------------------------------------
    # DSP Callbacks

    def dspParameterChanged(self, index, value):
        if index != 0:
            return

        nextCurPage = int(value)

        if nextCurPage != self.fCurPage and nextCurPage >= 1 and nextCurPage <= 100:
            self.saveCurrentTextState()
            self.fCurPage = nextCurPage

            self.fTextEdit.setPlainText(self.fNotes[self.fCurPage-1])
            self.fProgressBar.setValue(self.fCurPage)
            self.fProgressBar.update()

    def dspStateChanged(self, key, value):
        if key == "guiWidth":
            try:
                width = int(value)
            except:
                width = 0

            if width > 0:
                self.resize(width, self.height())

        elif key == "guiHeight":
            try:
                height = int(value)
            except:
                height = 0

            if height > 0:
                self.resize(self.width(), height)

        elif key.startswith("pageText #"):
            try:
                pageIndex = int(key.replace("pageText #",""))
            except:
                pageIndex = 0

            if pageIndex >= 1 and pageIndex <= 100:
                self.fNotes[pageIndex-1] = value

                if pageIndex == self.fCurPage:
                    self.fTextEdit.setPlainText(self.fNotes[pageIndex-1])

        elif key == "readOnly":
            readOnly = (value == "yes")
            self.fButton.setChecked(not readOnly)
            self.fTextEdit.setReadOnly(readOnly)

    # -------------------------------------------------------------------
    # ExternalUI Callbacks

    def uiShow(self):
        self.show()

    def uiFocus(self):
        self.setWindowState((self.windowState() & ~Qt.WindowMinimized) | Qt.WindowActive)
        self.show()

        self.raise_()
        self.activateWindow()

    def uiHide(self):
        self.hide()

    def uiQuit(self):
        self.closeExternalUI()
        self.close()
        app.quit()

    def uiTitleChanged(self, uiTitle):
        self.setWindowTitle(uiTitle)

    # -------------------------------------------------------------------
    # Qt events

    def resizeEvent(self, event):
        self.fSaveSizeNowChecker = 0
        QWidget.resizeEvent(self, event)

    def timerEvent(self, event):
        if event.timerId() == self.fIdleTimer:
            self.idleExternalUI()

            if self.fSaveSizeNowChecker == 11:
                self.sendConfigure("guiWidth", str(self.width()))
                self.sendConfigure("guiHeight", str(self.height()))
                self.fSaveSizeNowChecker = -1
            elif self.fSaveSizeNowChecker >= 0:
                self.fSaveSizeNowChecker += 1

            if self.fSaveTextNowChecker == 11:
                self.saveCurrentTextState()
                self.fSaveTextNowChecker = -1
            elif self.fSaveTextNowChecker >= 0:
                self.fSaveTextNowChecker += 1

        QWidget.timerEvent(self, event)

    def closeEvent(self, event):
        self.closeExternalUI()
        QWidget.closeEvent(self, event)

        # there might be other qt windows open which will block the UI from quitting
        app.quit()

#--------------- main ------------------
if __name__ == '__main__':
    import resources_rc

    pathBinaries, pathResources = getPaths()
    gCarla.utils = CarlaUtils(os.path.join(pathBinaries, "libcarla_utils." + DLL_EXTENSION))
    gCarla.utils.set_process_name("Notes")

    app = CarlaApplication("Notes")
    gui = DistrhoUINotes()
    app.exit_exec()