1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5 #include "nsPageContentFrame.h"
6 #include "nsCSSFrameConstructor.h"
7 #include "nsPresContext.h"
9 #include "nsIPresShell.h"
10 #include "nsSimplePageSequenceFrame.h"
12 using mozilla::LogicalSize
;
13 using mozilla::WritingMode
;
16 NS_NewPageContentFrame(nsIPresShell
* aPresShell
, nsStyleContext
* aContext
)
18 return new (aPresShell
) nsPageContentFrame(aContext
);
21 NS_IMPL_FRAMEARENA_HELPERS(nsPageContentFrame
)
24 nsPageContentFrame::Reflow(nsPresContext
* aPresContext
,
25 nsHTMLReflowMetrics
& aDesiredSize
,
26 const nsHTMLReflowState
& aReflowState
,
27 nsReflowStatus
& aStatus
)
29 DO_GLOBAL_REFLOW_COUNT("nsPageContentFrame");
30 DISPLAY_REFLOW(aPresContext
, this, aReflowState
, aDesiredSize
, aStatus
);
31 aStatus
= NS_FRAME_COMPLETE
; // initialize out parameter
33 if (GetPrevInFlow() && (GetStateBits() & NS_FRAME_FIRST_REFLOW
)) {
34 nsresult rv
= aPresContext
->PresShell()->FrameConstructor()
35 ->ReplicateFixedFrames(this);
41 // Set our size up front, since some parts of reflow depend on it
42 // being already set. Note that the computed height may be
43 // unconstrained; that's ok. Consumers should watch out for that.
44 nsSize
maxSize(aReflowState
.ComputedWidth(),
45 aReflowState
.ComputedHeight());
48 // A PageContentFrame must always have one child: the canvas frame.
49 // Resize our frame allowing it only to be as big as we are
50 // XXX Pay attention to the page's border and padding...
51 if (mFrames
.NotEmpty()) {
52 nsIFrame
* frame
= mFrames
.FirstChild();
53 WritingMode wm
= frame
->GetWritingMode();
54 LogicalSize
logicalSize(wm
, maxSize
);
55 nsHTMLReflowState
kidReflowState(aPresContext
, aReflowState
,
57 kidReflowState
.SetComputedBSize(logicalSize
.BSize(wm
));
59 // Reflow the page content area
60 ReflowChild(frame
, aPresContext
, aDesiredSize
, kidReflowState
, 0, 0, 0, aStatus
);
62 // The document element's background should cover the entire canvas, so
63 // take into account the combined area and any space taken up by
64 // absolutely positioned elements
65 nsMargin
padding(0,0,0,0);
67 // XXXbz this screws up percentage padding (sets padding to zero
68 // in the percentage padding case)
69 kidReflowState
.mStylePadding
->GetPadding(padding
);
71 // This is for shrink-to-fit, and therefore we want to use the
72 // scrollable overflow, since the purpose of shrink to fit is to
73 // make the content that ought to be reachable (represented by the
74 // scrollable overflow) fit in the page.
75 if (frame
->HasOverflowAreas()) {
76 // The background covers the content area and padding area, so check
77 // for children sticking outside the child frame's padding edge
78 nscoord xmost
= aDesiredSize
.ScrollableOverflow().XMost();
79 if (xmost
> aDesiredSize
.Width()) {
80 nscoord widthToFit
= xmost
+ padding
.right
+
81 kidReflowState
.mStyleBorder
->GetComputedBorderWidth(NS_SIDE_RIGHT
);
82 float ratio
= float(maxSize
.width
) / widthToFit
;
83 NS_ASSERTION(ratio
>= 0.0 && ratio
< 1.0, "invalid shrink-to-fit ratio");
84 mPD
->mShrinkToFitRatio
= std::min(mPD
->mShrinkToFitRatio
, ratio
);
88 // Place and size the child
89 FinishReflowChild(frame
, aPresContext
, aDesiredSize
, &kidReflowState
, 0, 0, 0);
91 NS_ASSERTION(aPresContext
->IsDynamic() || !NS_FRAME_IS_FULLY_COMPLETE(aStatus
) ||
92 !frame
->GetNextInFlow(), "bad child flow list");
95 // Reflow our fixed frames
96 nsReflowStatus fixedStatus
= NS_FRAME_COMPLETE
;
97 ReflowAbsoluteFrames(aPresContext
, aDesiredSize
, aReflowState
, fixedStatus
);
98 NS_ASSERTION(NS_FRAME_IS_COMPLETE(fixedStatus
), "fixed frames can be truncated, but not incomplete");
100 // Return our desired size
101 WritingMode wm
= aReflowState
.GetWritingMode();
102 aDesiredSize
.ISize(wm
) = aReflowState
.ComputedISize();
103 if (aReflowState
.ComputedBSize() != NS_UNCONSTRAINEDSIZE
) {
104 aDesiredSize
.BSize(wm
) = aReflowState
.ComputedBSize();
106 FinishAndStoreOverflow(&aDesiredSize
);
108 NS_FRAME_SET_TRUNCATION(aStatus
, aReflowState
, aDesiredSize
);
112 nsPageContentFrame::GetType() const
114 return nsGkAtoms::pageContentFrame
;
117 #ifdef DEBUG_FRAME_DUMP
119 nsPageContentFrame::GetFrameName(nsAString
& aResult
) const
121 return MakeFrameName(NS_LITERAL_STRING("PageContent"), aResult
);