GUI: Add DropdownButtonWidget and use it in the launcher for mass add

DropdownButtonWidget is a button split in two parts vertically. Clicking
the left part triggers a default action. Clicking the right part shows a
list of other actions the user can choose from.

Using this widget on the launcher lets 'Mass add' be a secondary action
of the 'Add' button, removing the necessity of pressing the shift key to
access the feature.

3 files changed, 47 insertions, 6 deletions

diff --git a/graphics/VectorRenderer.cpp b/graphics/VectorRenderer.cpp
index e226e45475..bcab4bf5a2 100644
--- a/graphics/VectorRenderer.cpp
+++ b/graphics/VectorRenderer.cpp
@@ -52,13 +52,48 @@ void VectorRenderer::drawStep(const Common::Rect &area, const Common::Rect &clip
 	setGradientFactor(step.factor);
 	setStrokeWidth(step.stroke);
 	setFillMode((FillMode)step.fillMode);
-	setClippingRect(clip);
+	setClippingRect(applyStepClippingRect(area, clip, step));
 
 	_dynamicData = extra;
 
 	(this->*(step.drawingCall))(area, step);
 }
 
+Common::Rect VectorRenderer::applyStepClippingRect(const Common::Rect &area, const Common::Rect &clip, const DrawStep &step) {
+	if (step.clip == Common::Rect()) {
+		return clip;
+	}
+
+	Common::Rect finalClip = clip;
+	if (step.clip.left > 0) {
+		finalClip.left = area.left + step.clip.left;
+	} else if (step.clip.left < 0) {
+		finalClip.left = area.right + step.clip.left;
+	}
+
+	if (step.clip.top > 0) {
+		finalClip.top = area.top + step.clip.top;
+	} else if (step.clip.top < 0) {
+		finalClip.top = area.bottom + step.clip.top;
+	}
+
+	if (step.clip.right > 0) {
+		finalClip.right = area.left + step.clip.right;
+	} else if (step.clip.right < 0) {
+		finalClip.right = area.right + step.clip.right;
+	}
+
+	if (step.clip.bottom > 0) {
+		finalClip.bottom = area.top + step.clip.bottom;
+	} else if (step.clip.bottom < 0) {
+		finalClip.bottom = area.bottom + step.clip.bottom;
+	}
+
+	finalClip.clip(clip);
+
+	return finalClip;
+}
+
 int VectorRenderer::stepGetRadius(const DrawStep &step, const Common::Rect &area) {
 	int radius = 0;
 
@@ -102,7 +137,7 @@ void VectorRenderer::stepGetPositions(const DrawStep &step, const Common::Rect &
 		}
 	} else {
 		in_x = area.left + step.padding.left;
-		in_w = area.width();
+		in_w = area.width() - step.padding.left - step.padding.right;
 	}
 
 	if (!step.autoHeight) {
@@ -133,7 +168,7 @@ void VectorRenderer::stepGetPositions(const DrawStep &step, const Common::Rect &
 		}
 	} else {
 		in_y = area.top + step.padding.top;
-		in_h = area.height();
+		in_h = area.height() - step.padding.top - step.padding.bottom;
 	}
 
 	if (step.scale != (1 << 16) && step.scale != 0) {
diff --git a/graphics/VectorRenderer.h b/graphics/VectorRenderer.h
index 9be55460c2..28a987a927 100644
--- a/graphics/VectorRenderer.h
+++ b/graphics/VectorRenderer.h
@@ -64,6 +64,7 @@ struct DrawStep {
 						  negative values mean counting from the opposite direction */
 
 	Common::Rect padding;
+	Common::Rect clip; /**< Clipping rect restriction */
 
 	enum VectorAlignment {
 		kVectorAlignManual,
@@ -392,6 +393,11 @@ public:
 	int stepGetRadius(const DrawStep &step, const Common::Rect &area);
 
 	/**
+	 * Restrict a draw call clipping rect with a step specific clipping rect
+	 */
+	Common::Rect applyStepClippingRect(const Common::Rect &area, const Common::Rect &clip, const DrawStep &step);
+
+	/**
 	 * DrawStep callback functions for each drawing feature
 	 */
 	void drawCallback_CIRCLE(const Common::Rect &area, const DrawStep &step) {
@@ -412,7 +418,7 @@ public:
 	void drawCallback_LINE(const Common::Rect &area, const DrawStep &step) {
 		uint16 x, y, w, h;
 		stepGetPositions(step, area, x, y, w, h);
-		drawLine(x, y, x + w, y + w);
+		drawLine(x, y, x + w, y + h);
 	}
 
 	void drawCallback_ROUNDSQ(const Common::Rect &area, const DrawStep &step) {
diff --git a/graphics/VectorRendererSpec.cpp b/graphics/VectorRendererSpec.cpp
index 457e9ff149..a1d8ba3599 100644
--- a/graphics/VectorRendererSpec.cpp
+++ b/graphics/VectorRendererSpec.cpp
@@ -670,9 +670,9 @@ gradientFillClip(PixelType *ptr, int width, int x, int y, int realX, int realY)
 	if (grad == 0 ||
 		_gradCache[curGrad] == _gradCache[curGrad + 1] || // no color change
 		stripSize < 2) { // the stip is small
-		colorFill<PixelType>(ptr, ptr + width, _gradCache[curGrad]);
+		colorFillClip<PixelType>(ptr, ptr + width, _gradCache[curGrad], realX, realY, _clippingArea);
 	} else if (grad == 3 && ox) {
-		colorFill<PixelType>(ptr, ptr + width, _gradCache[curGrad + 1]);
+		colorFillClip<PixelType>(ptr, ptr + width, _gradCache[curGrad + 1], realX, realY, _clippingArea);
 	} else {
 		for (int j = x; j < x + width; j++, ptr++) {
 			if (realX + j - x < _clippingArea.left || realX + j - x >= _clippingArea.right) continue;