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Fix overflow and clipping issues with 'overflow: auto' and 'overflow: hidden' on nested elements. See #116. Some additional tests added.

Michael Ragazzon 5 years ago
parent
23f7a42981
commit
c864264553
8 changed files with 160 additions and 7 deletions
Split View Show Diff Stats
  1. 16 3
      Source/Core/LayoutBlockBox.cpp
  2. 4 0
      Source/Core/LayoutBlockBox.h
  3. 52 0
      Tests/Data/VisualTests/float_basic.rml
  4. 43 0
      Tests/Data/VisualTests/float_overflow.rml
  5. 1 1
      Tests/Data/VisualTests/overflow_hidden.rml
  6. 42 0
      Tests/Data/VisualTests/overflow_nested.rml
  7. 1 2
      Tests/Data/style.rcss
  8. 1 1
      Tests/Source/VisualTests/XmlNodeHandlers.cpp

+ 16 - 3
Source/Core/LayoutBlockBox.cpp
View File 

@@ -39,7 +39,7 @@
 
 namespace Rml {
 
 
 // Creates a new block box for rendering a block element.
 
-LayoutBlockBox::LayoutBlockBox(LayoutEngine* _layout_engine, LayoutBlockBox* _parent, Element* _element) : position(0, 0)
 
+LayoutBlockBox::LayoutBlockBox(LayoutEngine* _layout_engine, LayoutBlockBox* _parent, Element* _element) : position(0), visible_outer_width(0)
 
 {
 
 	RMLUI_ZoneScoped;
 
 
@@ -211,10 +211,13 @@ LayoutBlockBox::CloseResult LayoutBlockBox::Close()
 
 		{
 
 			// Calculate the dimensions of the box's *internal* content; this is the tightest-fitting box around all of the
 
 			// internal elements, plus this element's padding.
 
-			Vector2f content_box(0, 0);
 
+			Vector2f content_box = Vector2f(0, 0);
 
 
 			for (size_t i = 0; i < block_boxes.size(); i++)
 
-				content_box.x = Math::Max(content_box.x, block_boxes[i]->GetBox().GetSize(Box::MARGIN).x);
 
+			{
 
+				// TODO: Only if the containing block is not an ancestor of us (ie. we are the containing block?).
 
+				content_box.x = Math::Max(content_box.x, block_boxes[i]->visible_outer_width);
 
+			}
 
 
 			// Check how big our floated area is.
 
 			Vector2f space_box = space->GetDimensions();
 
@@ -246,6 +249,16 @@ LayoutBlockBox::CloseResult LayoutBlockBox::Close()
 
 			element->SetBox(box);
 
 			element->SetContentBox(space->GetOffset(), content_box);
 
 
+			const float margin_width = GetBox().GetSize(Box::MARGIN).x;
 
+
 
+			// Set the visible outer width so that ancestors can catch any overflow produced by us. That is, hiding it or providing a scrolling mechanism.
 
+			// If we catch our own overflow here, then just use the normal margin box as that will effectively remove the overflow from our ancestor's perspective.
 
+			if (overflow_x_property != Style::Overflow::Visible)
 
+				visible_outer_width = margin_width;
 
+			else
 
+				visible_outer_width = Math::Max(margin_width, space->GetOffset().x + content_box.x + box.GetEdge(Box::MARGIN, Box::LEFT) + box.GetEdge(Box::MARGIN, Box::RIGHT));
 
+
 
+
 
 			// Format any scrollbars which were enabled on this element.
 
 			element->GetElementScroll()->FormatScrollbars();
 
 		}

+ 4 - 0
Source/Core/LayoutBlockBox.h
View File 

@@ -208,6 +208,7 @@ private:
 
 	Box box;
 
 	float min_height;
 
 	float max_height;
 
+
 
 	// Used by inline contexts only; set to true if the block box's line boxes should stretch to fit their inline content instead of wrapping.
 
 	bool wrap_content;
 
 
@@ -224,6 +225,9 @@ private:
 
 	// Used by block contexts only; stores the value of the overflow property for the element.
 
 	Style::Overflow overflow_x_property;
 
 	Style::Overflow overflow_y_property;
 
+	//  Used by block contexts only; the content width as visible from the parent. Similar to scroll width, but shrinked if overflow is caught here. 
+	//   This can be wider than the box if we are overflowing. Only available after the box has been closed. 
+	float visible_outer_width;
 
 	// Used by block contexts only; if true, we've enabled our vertical scrollbar.
 
 	bool vertical_overflow;

+ 52 - 0
Tests/Data/VisualTests/float_basic.rml
View File 

@@ -0,0 +1,52 @@
 
+<rml>
 
+<head>
 
+    <title>Floats, block formatting contexts</title>
 
+    <link type="text/rcss" href="../style.rcss"/>
 
+	<link rel="help" href="https://www.w3.org/TR/CSS21/visufx.html#propdef-overflow" />
 
+	<meta name="Description" content="Nesting divs should still hide overflow. Elements whose containing block is located above the 'overflow: hidden' element should be visible." />
 
+	<meta name="See also" content="CSS 2.1 'clipping-' and 'overflow-' tests." />
 
+	<style>
 
+		body {
 
+			background: #ddd;
 
+			color: #444;
 
+		}
 
+		#content {
 
+			width: 200px;
 
+			margin: 0 auto;
 
+		}
 
+		div.float {
 
+			float: left;
 
+			background-color: #bbb;
 
+			border: 1px #333;
 
+			width: 100px;
 
+			height: 100px;
 
+			margin: 5px;
 
+		}
 
+		.red {
 
+			color: red;
 
+		}
 
+	</style>
 
+</head>
 
+
 
+<body>
 
+<p>This test makes assumptions about the font properties, that is, it depends on the size of the layed-out text.</p>
 
+<div id="content">
 
+	<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
 
+	<div class="float">float: left</div>
 
+	<span class="red">This</span> is the first word after the float and should flow next to the float.</p>
 
+	<p>This paragraph should flow next to the float.</p>
 
+
 
+	<hr/>
 
+	<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
 
+	<div class="float">float: left</div>
 
+	<span class="red">This</span> is the first word after the float and should flow next to the float.</p>
 
+	<p style="clear: left;">This paragraph should be below the float as it clears the float.</p>
 
+
 
+	<hr/>
 
+	<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod.
 
+	<div class="float">float: left</div>
 
+	<span class="red">This</span> is the first word after the float and should flow next to the float.</p>
 
+	<p style="overflow: auto;">This paragraph should establish a new block formatting context. This element's size and position should not overlap with the float, but still be located next to it.</p>
 
+</div>
 
+</body>
 
+</rml>

+ 43 - 0
Tests/Data/VisualTests/float_overflow.rml
View File 

@@ -0,0 +1,43 @@
 
+<rml>
 
+<head>
 
+    <title>Floats: overflow</title>
 
+    <link type="text/rcss" href="../style.rcss"/>
 
+	<link rel="help" href="http://www.w3.org/TR/CSS21/visuren.html#floats" />
 
+	<meta name="Description" content="Floating boxes" />
 
+	<style>
 
+		body {
 
+			background: #ddd;
 
+			color: #444;
 
+		}
 
+		#content {
 
+			width: 200px;
 
+			margin: 0 auto;
 
+		}
 
+		.box {
 
+			background-color: #cce;
 
+			border: 5px #77b;
 
+		}
 
+		.float {
 
+			float: left;
 
+			background-color: #ddda;
 
+			border: 1px #333;
 
+			width: 200px;
 
+			height: 130px;
 
+			margin: 5px;
 
+		}
 
+		
+	</style>
 
+</head>
 
+
 
+<body>
 
+<div class="box">
 
+	<div class="float">float: left</div>
 
+	<p>The float to the left should extend past the background of the containing '.box' element.</p>
 
+</div>
 
+<hr/>
 
+<div class="box" style="overflow:auto">
 
+	<div class="float">float: left</div>
 
+	<p>Using 'overflow: auto' on the containing '.box' element. This should establish a new block formatting context (thereby resolving all floats) so that the background wraps around the entire float.</p>
 
+</div>
 
+</body>
 
+</rml>

+ 1 - 1
Tests/Data/VisualTests/overflow_hidden.rml
View File 

@@ -4,6 +4,7 @@
 
     <link type="text/rcss" href="../style.rcss"/>
 
     <link rel="match" href="reference/overflow_hidden-ref.rml"/>
 
 	<link rel="help" href="https://www.w3.org/TR/CSS21/visufx.html#propdef-overflow" />
 
+	<link rel="GitHub issue" href="https://github.com/mikke89/RmlUi/issues/116" />
 
 	<meta name="Description" content="Nesting divs should still hide overflow. Elements whose containing block is located above the 'overflow: hidden' element should be visible." />
 
 	<meta name="See also" content="CSS 2.1 'clipping-' and 'overflow-' tests." />
 
 	<style>
 
@@ -43,7 +44,6 @@
 
 <body>
 
 <p>There should be a green box, no red visible, and the word 'fail' should not appear.</p>
 
 <div class="overflow">
 
-<!-- Nesting an extra div appears to break overflow in RmlUi. Setting it to 'display: inline' appears to make it work correctly. -->
 
 	<div>
 
 		<div class="wide">FAIL</div>
 
 		LONG_WOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOORD&nbsp;FAIL

+ 42 - 0
Tests/Data/VisualTests/overflow_nested.rml
View File 

@@ -0,0 +1,42 @@
 
+<rml>
 
+<head>
 
+    <title>Nested overflow</title>
 
+    <link type="text/rcss" href="../style.rcss"/>
 
+	<meta name="Description" content="The deepest element in the tree should catch the overflow." />
 
+	<style>
 
+		body {
 
+			display: block;
 
+			background: #ddd;
 
+			color: #444;
 
+		}
 
+		div.outer {
 
+			overflow: auto;
 
+			width: 200px;
 
+			height: 200px;
 
+		}
 
+		div.overflow {
 
+			border: 1px black;
 
+			overflow: auto;
 
+			width: 150px;
 
+			height: 150px;
 
+		}
 
+		div.wide {
 
+			width: 300px;
 
+			height: 20px;
 
+			text-align: center;
 
+			border: 1px #0a0;
 
+			margin: 5px;
 
+			background-color: #eee;
 
+		}
 
+	</style>
 
+</head>
 
+
 
+<body>
 
+<p>There should should only be one scroll bar visible, inside the black border.</p>
 
+<div class="outer">
 
+	<div class="overflow">
 
+		<div class="wide">Wide element</div>
 
+	</div>
 
+</div>
 
+</body>
 
+</rml>

+ 1 - 2
Tests/Data/style.rcss
View File 

@@ -27,6 +27,7 @@ body {
 
 	padding: 8px;
 
 	width: 484px;
 
 	min-height: 484px;
 
+	max-height: 100%;
 
 	color: black;
 
 	background: #ccc;
 
 	overflow: auto;
 
@@ -52,12 +53,10 @@ a:active {
 
 scrollbarvertical
 
 {
 
 	width: 16dp;
 
-	scrollbar-margin: 16px;
 
 }
 
 scrollbarhorizontal
 
 {
 
 	height: 16dp;
 
-	scrollbar-margin: 16px;
 
 }
 
 scrollbarvertical slidertrack,
 
 scrollbarhorizontal slidertrack

+ 1 - 1
Tests/Source/VisualTests/XmlNodeHandlers.cpp
View File 

@@ -83,8 +83,8 @@ Element* XMLNodeHandlerLink::ElementStart(XMLParser* parser, const String& name,
 
 {
 
 	RMLUI_ASSERT(name == "link");
 
 
-	const String rel = StringUtilities::ToLower(Get<String>(attributes, "rel", ""));
 
 	const String type = StringUtilities::ToLower(Get<String>(attributes, "type", ""));
 
+	const String rel = Get<String>(attributes, "rel", "");
 
 	const String href = Get<String>(attributes, "href", "");
 
 
 	if (!type.empty() && !href.empty())