layout/generic/nsLeafFrame.cpp

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  37
  38 /* base class for rendering objects that do not have child lists */
  39
  40 #include "nsCOMPtr.h"
  41 #include "nsLeafFrame.h"
  42 #include "nsHTMLContainerFrame.h"
  43 #include "nsHTMLParts.h"
  44 #include "nsIPresShell.h"
  45 #include "nsPresContext.h"
  46
  47 nsLeafFrame::~nsLeafFrame()
  48 {
  49 }
  50
  51 /* virtual */ nscoord
  52 nsLeafFrame::GetMinWidth(nsIRenderingContext *aRenderingContext)
  53 {
  54   nscoord result;
  55   DISPLAY_MIN_WIDTH(this, result);
  56
  57   result = GetIntrinsicWidth();
  58   return result;
  59 }
  60
  61 /* virtual */ nscoord
  62 nsLeafFrame::GetPrefWidth(nsIRenderingContext *aRenderingContext)
  63 {
  64   nscoord result;
  65   DISPLAY_PREF_WIDTH(this, result);
  66   result = GetIntrinsicWidth();
  67   return result;
  68 }
  69
  70 /* virtual */ nsSize
  71 nsLeafFrame::ComputeAutoSize(nsIRenderingContext *aRenderingContext,
  72                              nsSize aCBSize, nscoord aAvailableWidth,
  73                              nsSize aMargin, nsSize aBorder,
  74                              nsSize aPadding, PRBool aShrinkWrap)
  75 {
  76   return nsSize(GetIntrinsicWidth(), GetIntrinsicHeight());
  77 }
  78
  79 NS_IMETHODIMP
  80 nsLeafFrame::Reflow(nsPresContext* aPresContext,
  81                     nsHTMLReflowMetrics& aMetrics,
  82                     const nsHTMLReflowState& aReflowState,
  83                     nsReflowStatus& aStatus)
  84 {
  85   DO_GLOBAL_REFLOW_COUNT("nsLeafFrame");
  86   NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS,
  87                  ("enter nsLeafFrame::Reflow: aMaxSize=%d,%d",
  88                   aReflowState.availableWidth, aReflowState.availableHeight));
  89
  90   NS_PRECONDITION(mState & NS_FRAME_IN_REFLOW, "frame is not in reflow");
  91
  92   DoReflow(aPresContext, aMetrics, aReflowState, aStatus);
  93
  94   FinishAndStoreOverflow(&aMetrics);
  95   return NS_OK;
  96 }
  97
  98 NS_IMETHODIMP
  99 nsLeafFrame::DoReflow(nsPresContext* aPresContext,
 100                       nsHTMLReflowMetrics& aMetrics,
 101                       const nsHTMLReflowState& aReflowState,
 102                       nsReflowStatus& aStatus)
 103 {
 104   NS_ASSERTION(aReflowState.ComputedWidth() != NS_UNCONSTRAINEDSIZE,
 105                "Shouldn't have unconstrained stuff here "
 106                "Thanks to the rules of reflow");
 107   NS_ASSERTION(NS_INTRINSICSIZE != aReflowState.ComputedHeight(),
 108                "Shouldn't have unconstrained stuff here "
 109                "thanks to ComputeAutoSize");
 110
 111   aMetrics.width = aReflowState.ComputedWidth();
 112   aMetrics.height = aReflowState.ComputedHeight();
 113
 114   AddBordersAndPadding(aReflowState, aMetrics);
 115   aStatus = NS_FRAME_COMPLETE;
 116
 117   NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS,
 118                  ("exit nsLeafFrame::DoReflow: size=%d,%d",
 119                   aMetrics.width, aMetrics.height));
 120   NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aMetrics);
 121
 122   aMetrics.mOverflowArea =
 123     nsRect(0, 0, aMetrics.width, aMetrics.height);
 124
 125   return NS_OK;
 126 }
 127
 128 nscoord
 129 nsLeafFrame::GetIntrinsicHeight()
 130 {
 131   NS_NOTREACHED("Someone didn't override Reflow or ComputeAutoSize");
 132   return 0;
 133 }
 134
 135 // XXX how should border&padding effect baseline alignment?
 136 // => descent = borderPadding.bottom for example
 137 void
 138 nsLeafFrame::AddBordersAndPadding(const nsHTMLReflowState& aReflowState,
 139                                   nsHTMLReflowMetrics& aMetrics)
 140 {
 141   aMetrics.width += aReflowState.mComputedBorderPadding.LeftRight();
 142   aMetrics.height += aReflowState.mComputedBorderPadding.TopBottom();
 143 }
 144
 145 void
 146 nsLeafFrame::SizeToAvailSize(const nsHTMLReflowState& aReflowState,
 147                              nsHTMLReflowMetrics& aDesiredSize)
 148 {
 149   aDesiredSize.width  = aReflowState.availableWidth; // FRAME
 150   aDesiredSize.height = aReflowState.availableHeight;
 151   aDesiredSize.mOverflowArea =
 152     nsRect(0, 0, aDesiredSize.width, aDesiredSize.height);
 153   FinishAndStoreOverflow(&aDesiredSize);
 154 }