Merge pull request #47 from geo-stack/add_multistate_button

PR: Add multi-state toolbutton

Author: jnsebgosselin

qtapputils/testing.py

@@ -0,0 +1,39 @@
+# -*- coding: utf-8 -*-
+# -----------------------------------------------------------------------------
+# Copyright © QtAppUtils Project Contributors
+# https://github.com/geo-stack/qtapputils
+#
+# This file is part of QtAppUtils.
+# Licensed under the terms of the MIT License.
+# -----------------------------------------------------------------------------
+
+"""
+Helper functions for testing.
+"""
+
+from qtpy.QtGui import QIcon
+from qtpy.QtCore import QSize
+
+
+def icons_are_equal(icon1: QIcon, icon2: QIcon, size: QSize = QSize(16, 16)):
+    """
+    Return True if two QIcon objects have identical image data at
+    the given size.
+
+    Parameters
+    ----------
+    icon1 : QIcon
+        The first icon to compare.
+    icon2 : QIcon
+        The second icon to compare.
+    size : QSize, optional
+        The size at which to compare the icons (default is 16x16).
+
+    Returns
+    -------
+    bool
+        True if the icons look the same at the specified size, False otherwise.
+    """
+    pm1 = icon1.pixmap(size)
+    pm2 = icon2.pixmap(size)
+    return pm1.toImage() == pm2.toImage()

qtapputils/widgets/buttons.py

@@ -0,0 +1,74 @@
+# -*- coding: utf-8 -*-
+# -----------------------------------------------------------------------------
+# Copyright © QtAppUtils Project Contributors
+# https://github.com/geo-stack/qtapputils
+#
+# This file is part of QtAppUtils.
+# Licensed under the terms of the MIT License.
+# -----------------------------------------------------------------------------
+
+
+# ---- Third party imports
+from qtpy.QtCore import Signal
+from qtpy.QtGui import QIcon
+from qtpy.QtWidgets import QToolButton, QWidget
+
+
+class MultiStateToolButton(QToolButton):
+    """
+    A QToolButton that cycles through a list of icons each time it is clicked.
+
+    Parameters
+    ----------
+    icons : list of QIcon
+        The list of icons to cycle through.
+    parent : QWidget, optional
+        The parent widget.
+    index : int, optional
+        The index of the starting icon (default is 0).
+
+    Signals
+    -------
+    sig_index_changed : Signal(int)
+        Signal emitted with the new index whenever the current state changes.
+    """
+
+    sig_index_changed = Signal(int)
+
+    def __init__(
+            self, icons: list[QIcon],
+            parent: QWidget = None,
+            index: int = 0
+            ):
+        super().__init__(parent)
+
+        self.setAutoRaise(True)
+        self.setCheckable(False)
+
+        self._icons = icons
+        self._current_index = index
+
+        self.clicked.connect(self._handle_clicked)
+        self._update_icon()
+
+    def current_index(self):
+        return self._current_index
+
+    def set_current_index(self, index: int):
+        if index >= len(self._icons):
+            index = 0
+        elif index < 0:
+            index = len(self._icons) - 1
+
+        if index == self._current_index:
+            return
+
+        self._current_index = index
+        self._update_icon()
+        self.sig_index_changed.emit(index)
+
+    def _update_icon(self):
+        self.setIcon(self._icons[self._current_index])
+
+    def _handle_clicked(self):
+        self.set_current_index(self._current_index + 1)

qtapputils/widgets/path.py

@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 # -----------------------------------------------------------------------------
 # Copyright © QtAppUtils Project Contributors
-# https://github.com/jnsebgosselin/qtapputils
+# https://github.com/geo-stack/qtapputils
 #
 # This file is part of QtAppUtils.
 # Licensed under the terms of the MIT License.

qtapputils/widgets/tests/test_buttons.py

@@ -0,0 +1,96 @@
+# -*- coding: utf-8 -*-
+# -----------------------------------------------------------------------------
+# Copyright © QtAppUtils Project Contributors
+# https://github.com/geo-stack/qtapputils
+#
+# This file is part of QtAppUtils.
+# Licensed under the terms of the MIT License.
+# -----------------------------------------------------------------------------
+
+import pytest
+from qtpy.QtGui import QIcon, QPixmap
+from qtpy.QtCore import Qt
+from qtpy.QtTest import QSignalSpy
+
+from qtapputils.widgets.buttons import MultiStateToolButton
+from qtapputils.testing import icons_are_equal
+
+
+@pytest.fixture
+def icons():
+    # Create dummy QIcons for testing
+    pixmap1 = QPixmap(16, 16)
+    pixmap1.fill(Qt.red)
+    pixmap2 = QPixmap(16, 16)
+    pixmap2.fill(Qt.green)
+    pixmap3 = QPixmap(16, 16)
+    pixmap3.fill(Qt.blue)
+    return [QIcon(pixmap1), QIcon(pixmap2), QIcon(pixmap3)]
+
+
+@pytest.fixture
+def button(icons, qtbot):
+
+    btn = MultiStateToolButton(icons)
+    qtbot.addWidget(btn)
+    btn.show()
+    qtbot.waitUntil(btn.isVisible)
+
+    assert btn.current_index() == 0
+    assert icons_are_equal(btn.icon(), icons[0])
+
+    return btn
+
+
+def test_cycle_icons(button, qtbot, icons):
+    """Test icon cycles forward with clicks and wraps around."""
+    signal_spy = QSignalSpy(button.sig_index_changed)
+
+    qtbot.mouseClick(button, Qt.LeftButton)
+
+    assert len(signal_spy) == 1
+    assert signal_spy[-1] == [1]
+    assert icons_are_equal(button.icon(), icons[1])
+
+    qtbot.mouseClick(button, Qt.LeftButton)
+
+    assert len(signal_spy) == 2
+    assert signal_spy[-1] == [2]
+    assert icons_are_equal(button.icon(), icons[2])
+
+    # Should wrap back to 0.
+    qtbot.mouseClick(button, Qt.LeftButton)
+
+    assert len(signal_spy) == 3
+    assert signal_spy[-1] == [0]
+    assert icons_are_equal(button.icon(), icons[0])
+
+
+def test_set_index(button, qtbot, icons):
+    """Test icon is set as expected when index is set programattically."""
+    signal_spy = QSignalSpy(button.sig_index_changed)
+
+    # Should wrap back to len(icons) - 1.
+    button.set_current_index(-1)
+
+    assert len(signal_spy) == 1
+    assert signal_spy[-1] == [2]
+    assert icons_are_equal(button.icon(), icons[2])
+
+    # Should wrap back to 0.
+    button.set_current_index(100)
+
+    assert len(signal_spy) == 2
+    assert signal_spy[-1] == [0]
+    assert icons_are_equal(button.icon(), icons[0])
+
+    # Should do nothing.
+    button.set_current_index(100)
+
+    assert len(signal_spy) == 2
+    assert signal_spy[-1] == [0]
+    assert icons_are_equal(button.icon(), icons[0])
+
+
+if __name__ == '__main__':
+    pytest.main(['-x', __file__, '-vv', '-rw'])