256 lines
8.3 KiB
C++
256 lines
8.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#include "nsCOMPtr.h"
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#include "nsHTMLParts.h"
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#include "nsIHTMLContent.h"
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#include "nsLeafFrame.h"
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#include "nsIRenderingContext.h"
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#include "nsIStyleContext.h"
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#include "nsColor.h"
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#include "nsIPresContext.h"
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#include "nsIStyleContext.h"
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#include "nsHTMLIIDs.h"
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#include "nsHTMLAtoms.h"
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#include "nsIFontMetrics.h"
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#include "nsIHTMLAttributes.h"
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#include "nsStyleConsts.h"
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#include "nsCSSRendering.h"
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#include "nsIDOMHTMLHRElement.h"
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#include "nsIDeviceContext.h"
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#include "nsStyleUtil.h"
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static NS_DEFINE_IID(kIDOMHTMLHRElementIID, NS_IDOMHTMLHRELEMENT_IID);
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// default hr thickness in pixels
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#define DEFAULT_THICKNESS 3
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class HRuleFrame : public nsFrame {
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public:
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HRuleFrame();
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NS_IMETHOD Reflow(nsIPresContext& aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus);
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NS_IMETHOD Paint(nsIPresContext& aPresContext,
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nsIRenderingContext& aRenderingContext,
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const nsRect& aDirtyRect,
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nsFramePaintLayer aWhichLayer);
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protected:
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PRBool GetNoShade();
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nsMargin mBorderPadding;
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nscoord mThickness;
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};
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nsresult
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NS_NewHRFrame(nsIFrame** aNewFrame)
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{
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NS_PRECONDITION(aNewFrame, "null OUT ptr");
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if (nsnull == aNewFrame) {
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return NS_ERROR_NULL_POINTER;
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}
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HRuleFrame* it = new HRuleFrame;
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if (nsnull == it) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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*aNewFrame = it;
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return NS_OK;
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}
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HRuleFrame::HRuleFrame()
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{
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}
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NS_METHOD
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HRuleFrame::Paint(nsIPresContext& aPresContext,
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nsIRenderingContext& aRenderingContext,
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const nsRect& aDirtyRect,
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nsFramePaintLayer aWhichLayer)
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{
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if (NS_FRAME_PAINT_LAYER_FOREGROUND != aWhichLayer) {
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return NS_OK;
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}
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const nsStyleDisplay* disp =
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(const nsStyleDisplay*)mStyleContext->GetStyleData(eStyleStruct_Display);
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if (!disp->mVisible) {
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return NS_OK;
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}
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float p2t;
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aPresContext.GetScaledPixelsToTwips(&p2t);
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nscoord thickness = mThickness;
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// Get style data
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nscoord x0 = mBorderPadding.left;
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nscoord y0 = mBorderPadding.top;
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nscoord width = mRect.width -
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(mBorderPadding.left + mBorderPadding.right);
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nscoord height = mRect.height -
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(mBorderPadding.top + mBorderPadding.bottom);
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// Center hrule vertically within the available space
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y0 += (height - thickness) / 2;
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height = thickness;
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// To shade or not to shade, that is the question. Begin by collecting the
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// three decision criteria: rendering to the printer or the display, is the
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// "Beveled Lines" checkbox set in the page setup dialog, and does the tag
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// have the NOSHADE attribute set.
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PRBool noShadeAttribute = GetNoShade();
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// Now that we have the data to make the shading criteria, we next
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// collect the decision criteria for rending in solid black:
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// printing (which we already have) and the "Black Lines" setting in
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// the page setup dialog
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const nsStyleColor* color;
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// Draw a "shadowed" box around the rule area
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if (!noShadeAttribute) {
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nsRect rect(x0, y0, width, height);
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const nsStyleSpacing* spacing =
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(nsStyleSpacing*)mStyleContext->GetStyleData(eStyleStruct_Spacing);
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color = (nsStyleColor*)mStyleContext->GetStyleData(eStyleStruct_Color);
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nsCSSRendering::PaintBackground(aPresContext, aRenderingContext,
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this,aDirtyRect, rect, *color,
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*spacing, 0, 0);
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nsCSSRendering::PaintBorder(aPresContext, aRenderingContext,
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this,aDirtyRect, rect, *spacing,
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mStyleContext, 0);
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} else {
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nscolor colors[2];
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// Get the background color that applies to this HR
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color = nsStyleUtil::FindNonTransparentBackground(mStyleContext);
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NS_Get3DColors(colors, color->mBackgroundColor);
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// When a rule is not shaded, then we use a uniform color and
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// draw half-circles on the end points.
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aRenderingContext.SetColor (colors[0]);
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nscoord diameter = height;
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if ((diameter > width) || (diameter < NSIntPixelsToTwips(3, p2t))) {
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// The half-circles on the ends of the rule aren't going to
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// look right so don't bother drawing them.
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aRenderingContext.FillRect(x0, y0, width, height);
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} else {
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aRenderingContext.FillArc(x0, y0, diameter, diameter, 90.0f, 270.0f);
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aRenderingContext.FillArc(x0 + width - diameter, y0,
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diameter, diameter, 270.0f, 180.0f);
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aRenderingContext.FillRect(x0 + diameter/2, y0,
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width - diameter, height);
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}
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}
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return nsFrame::Paint(aPresContext, aRenderingContext, aDirtyRect, aWhichLayer);
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}
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NS_IMETHODIMP
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HRuleFrame::Reflow(nsIPresContext& aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus)
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{
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NS_PRECONDITION(mState & NS_FRAME_IN_REFLOW, "frame is not in reflow");
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// Compute the width
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float p2t;
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aPresContext.GetScaledPixelsToTwips(&p2t);
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if (NS_UNCONSTRAINEDSIZE != aReflowState.mComputedWidth) {
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aDesiredSize.width = aReflowState.mComputedWidth;
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}
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else {
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if (NS_UNCONSTRAINEDSIZE == aReflowState.availableWidth) {
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aDesiredSize.width = nscoord(p2t);
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}
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else {
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aDesiredSize.width = aReflowState.availableWidth;
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}
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}
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aDesiredSize.width += aReflowState.mComputedBorderPadding.left +
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aReflowState.mComputedBorderPadding.right;
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// Get the thickness of the rule. Note that this specifies the
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// height of the rule, not the height of the frame.
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nscoord thickness;
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if (NS_UNCONSTRAINEDSIZE != aReflowState.mComputedHeight) {
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thickness = aReflowState.mComputedHeight;
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}
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else {
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thickness = NSIntPixelsToTwips(DEFAULT_THICKNESS, p2t);
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}
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mThickness = thickness;
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// Compute height of "line" that hrule will layout within. Use the
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// font-size to do this.
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nscoord minLineHeight = thickness + NSIntPixelsToTwips(2, p2t);
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const nsStyleFont* font;
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GetStyleData(eStyleStruct_Font, (const nsStyleStruct*&) font);
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const nsFont& f = font->mFont;
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nsCOMPtr<nsIFontMetrics> fm;
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aPresContext.GetMetricsFor(f, getter_AddRefs(fm));
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nscoord fontHeight;
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fm->GetHeight(fontHeight);
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aDesiredSize.height =
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(minLineHeight < fontHeight ? fontHeight : minLineHeight) +
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aReflowState.mComputedBorderPadding.top +
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aReflowState.mComputedBorderPadding.bottom;
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aDesiredSize.ascent = aDesiredSize.height;
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aDesiredSize.descent = 0;
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// HR's do not impact the max-element-size, unless a width is
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// specified otherwise tables behave badly. This makes sense -- they
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// are springy.
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if (nsnull != aDesiredSize.maxElementSize) {
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nscoord onePixel = NSIntPixelsToTwips(1, p2t);
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if (NS_UNCONSTRAINEDSIZE != aReflowState.mComputedWidth) {
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if (eStyleUnit_Percent ==
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aReflowState.mStylePosition->mWidth.GetUnit()) {
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// When the HR is using a percentage width, make sure it
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// remains springy.
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aDesiredSize.maxElementSize->width = onePixel;
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}
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else {
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aDesiredSize.maxElementSize->width = aReflowState.mComputedWidth;
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}
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}
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else {
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aDesiredSize.maxElementSize->width = onePixel;
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}
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aDesiredSize.maxElementSize->height = aDesiredSize.height;
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}
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aStatus = NS_FRAME_COMPLETE;
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return NS_OK;
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}
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PRBool
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HRuleFrame::GetNoShade()
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{
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PRBool result = PR_FALSE;
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nsIDOMHTMLHRElement* hr = nsnull;
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mContent->QueryInterface(kIDOMHTMLHRElementIID, (void**) &hr);
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if (nsnull != hr) {
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hr->GetNoShade(&result);
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NS_RELEASE(hr);
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}
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return result;
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}
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