Improve preview frame visibilty of cursor condition

* Add transparent diagonal stripes to frame
* Do not show frame if invalid selection was made

CMakeLists.txt

@@ -268,6 +268,8 @@ target_sources(
           src/utils/slider-spinbox.hpp
           src/utils/source-selection.cpp
           src/utils/source-selection.hpp
+          src/utils/striped-frame.cpp
+          src/utils/striped-frame.hpp
           src/utils/transition-selection.cpp
           src/utils/transition-selection.hpp
           src/utils/utility.cpp

src/macro-core/macro-condition-cursor.cpp

@@ -334,18 +334,20 @@ void MacroConditionCursorEdit::SetupFrame()
 			      Qt::WindowStaysOnTopHint);
 	_frame.setAttribute(Qt::WA_TranslucentBackground, true);
 
-	if (_entryData) {
-		QRect rect(_entryData->_minX, _entryData->_minY,
-			   _entryData->_maxX - _entryData->_minX,
-			   _entryData->_maxY - _entryData->_minY);
-
-		if (rect.size().height() == 0 || rect.size().width() == 0) {
-			_frame.setGeometry(0, 0, 1, 1);
-			return;
-		}
-
-		_frame.setGeometry(getScreenUnionRect().intersected(rect));
+	if (!_entryData) {
+		return;
 	}
+
+	QRect rect(_entryData->_minX, _entryData->_minY,
+		   _entryData->_maxX - _entryData->_minX,
+		   _entryData->_maxY - _entryData->_minY);
+
+	if (rect.size().height() <= 0 || rect.size().width() <= 0) {
+		_frame.setGeometry(0, 0, 1, 1);
+		return;
+	}
+
+	_frame.setGeometry(getScreenUnionRect().intersected(rect));
 }
 
 void MacroConditionCursorEdit::UpdateEntryData()

src/macro-core/macro-condition-cursor.hpp

@@ -1,11 +1,11 @@
 #pragma once
 #include "macro.hpp"
+#include "striped-frame.hpp"
 
 #include <QSpinBox>
 #include <QComboBox>
 #include <QPushButton>
 #include <QTimer>
-#include <QFrame>
 
 class MacroConditionCursor : public MacroCondition {
 public:
@@ -86,6 +86,6 @@ private:
 	void SetWidgetVisibility();
 	void SetupFrame();
 	QTimer _timer;
-	QFrame _frame;
+	StripedFrame _frame;
 	bool _loading = true;
 };

src/utils/striped-frame.cpp

@@ -0,0 +1,37 @@
+#include "striped-frame.hpp"
+
+#include <cmath>
+
+constexpr QColor stripeColor = QColor(255, 255, 255, 50);
+constexpr int stripeWidth = 30;
+constexpr int stripeSpacing = 30;
+constexpr qreal sqrtOf2 = 1.41421356237309;
+constexpr int painterVerticalOffset = stripeWidth / sqrtOf2 + 1;
+constexpr int rotatedPainterSpacing =
+	(stripeWidth + stripeSpacing) / sqrtOf2 + 1;
+constexpr qreal horizontalMoveStep = stripeWidth + stripeSpacing;
+constexpr qreal verticalMoveStep = -horizontalMoveStep;
+
+void StripedFrame::paintEvent(QPaintEvent *event)
+{
+	QFrame::paintEvent(event);
+
+	QPainter painter(this);
+	painter.setPen(Qt::NoPen);
+	painter.setBrush(stripeColor);
+
+	const int biggerSideSize = width() > height() ? width() : height();
+	const int numStripes = biggerSideSize / rotatedPainterSpacing + 1;
+
+	painter.translate(0, -painterVerticalOffset);
+	painter.rotate(45);
+
+	const qreal diagonalLength =
+		std::sqrt(width() * width() + height() * height());
+	const qreal stripeLength = diagonalLength * 2;
+
+	for (int i = 0; i < numStripes; ++i) {
+		painter.drawRect(0, 0, stripeWidth, stripeLength);
+		painter.translate(horizontalMoveStep, verticalMoveStep);
+	}
+}

src/utils/striped-frame.hpp

@@ -0,0 +1,11 @@
+#pragma once
+#include <QFrame>
+#include <QPainter>
+
+class StripedFrame : public QFrame {
+public:
+	StripedFrame(QWidget *parent = nullptr) : QFrame(parent) {}
+
+protected:
+	void paintEvent(QPaintEvent *event) override;
+};