Scrub numbers by dragging their labels in the tool bars and layer opacity (12.12c1)

tests/ScrubFixtures.h

@@ -0,0 +1,76 @@
+#pragma once
+#include "SelectionFixtures.h"
+#include "SessionFixtures.h"
+#include <QLabel>
+#include <QLineEdit>
+#include <QtTest>
+
+// Shared by the scrubbable label tests: finding, dragging, typing.
+
+// The scrubbing labels saying `text`, left to right.
+inline QLabel &scrubbed(QWidget &root, const QString &text, int index = 0)
+{
+    std::vector<QLabel *> found;
+    for (QLabel *label : root.findChildren<QLabel *>())
+        if (label->text() == text && label->testAttribute(Qt::WA_SetCursor) && label->cursor().shape() == Qt::SizeHorCursor)
+            found.push_back(label);
+    std::sort(found.begin(), found.end(), [&root](QLabel *a, QLabel *b) { return a->mapTo(&root, QPoint()).x() < b->mapTo(&root, QPoint()).x(); });
+    if (size_t(index) >= found.size())
+        throw std::runtime_error("no scrubbing label " + text.toStdString());
+    return *found[size_t(index)];
+}
+
+inline void send(QWidget &widget, QEvent::Type type, QPointF at, Qt::MouseButton button, Qt::MouseButtons buttons)
+{
+    QMouseEvent event(type, at, widget.mapToGlobal(at), button, buttons, Qt::NoModifier);
+    QApplication::sendEvent(&widget, &event);
+}
+
+// Presses, drags `dx` points sideways, and lets go.
+inline void drag(QWidget &label, double dx, bool release = true)
+{
+    send(label, QEvent::MouseButtonPress, QPointF(2, 2), Qt::LeftButton, Qt::LeftButton);
+    send(label, QEvent::MouseMove, QPointF(2 + dx, 2), Qt::NoButton, Qt::LeftButton);
+    if (release)
+        send(label, QEvent::MouseButtonRelease, QPointF(2 + dx, 2), Qt::LeftButton, Qt::NoButton);
+}
+
+// Types 7, which applies, then scrubs, holding the press.
+inline QString scrubOverTyping(QLineEdit &field, QWidget &label, double dx)
+{
+    field.setFocus();
+    field.selectAll();
+    QTest::keyClicks(&field, QStringLiteral("7"));
+    if (!field.hasFocus())
+        throw std::runtime_error("the field lost its focus");
+    drag(label, dx, false);
+    const QString during = field.text();
+    send(label, QEvent::MouseButtonRelease, QPointF(2 + dx, 2), Qt::LeftButton, Qt::NoButton);
+    if (field.text() != during || !field.hasFocus())
+        throw std::runtime_error("the release changed the field");
+    return during;
+}
+
+// Shown in an active window, so fields take the focus.
+inline void showActive(QWidget &widget)
+{
+    widget.show();
+    widget.activateWindow();
+    if (!QTest::qWaitForWindowActive(&widget))
+        throw std::runtime_error("the bar never became active");
+}
+
+template <typename Widget> inline Widget &find(QWidget &root, const char *name)
+{
+    auto *found = root.findChild<Widget *>(QString::fromUtf8(name));
+    if (!found)
+        throw std::runtime_error(name);
+    return *found;
+}
+
+inline ImportedImage pixels(int width, int height)
+{
+    QImage image(width, height, QImage::Format_RGBA8888_Premultiplied);
+    image.fill(Qt::white);
+    return ImportedImage(image, image, "Pixels");
+}