The Tor Browser: layout/xul/nsListBoxLayout.cpp@925c144e1f1f (annotated)

layout/xul/nsListBoxLayout.cpp@925c144e1f1f (annotated)

layout/xul/nsListBoxLayout.cpp

Fri, 16 Jan 2015 18:13:44 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Fri, 16 Jan 2015 18:13:44 +0100
branch: TOR_BUG_9701
changeset 14: 925c144e1f1f
permissions: -rw-r--r--

Integrate suggestion from review to improve consistency with existing code.

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include "nsListBoxLayout.h"
 #include "nsListBoxBodyFrame.h"
 #include "nsBox.h"
 #include "nsBoxLayoutState.h"
 #include "nsIScrollableFrame.h"
 #include "nsIReflowCallback.h"
 #include "nsNameSpaceManager.h"
 #include "nsGkAtoms.h"
 #include "nsContentUtils.h"
 nsListBoxLayout::nsListBoxLayout() : nsGridRowGroupLayout()
 {
 }
 ////////// nsBoxLayout //////////////
 nsSize
 nsListBoxLayout::GetPrefSize(nsIFrame* aBox, nsBoxLayoutState& aBoxLayoutState)
 {
   nsSize pref = nsGridRowGroupLayout::GetPrefSize(aBox, aBoxLayoutState);
   nsListBoxBodyFrame* frame = static_cast<nsListBoxBodyFrame*>(aBox);
   if (frame) {
     nscoord rowheight = frame->GetRowHeightAppUnits();
     pref.height = frame->GetRowCount() * rowheight;
     // Pad the height.
     nscoord y = frame->GetAvailableHeight();
     if (pref.height > y && y > 0 && rowheight > 0) {
       nscoord m = (pref.height-y)%rowheight;
       nscoord remainder = m == 0 ? 0 : rowheight - m;
       pref.height += remainder;
     }
     if (nsContentUtils::HasNonEmptyAttr(frame->GetContent(), kNameSpaceID_None,
                                         nsGkAtoms::sizemode)) {
       nscoord width = frame->ComputeIntrinsicWidth(aBoxLayoutState);
       if (width > pref.width)
         pref.width = width;
     }
   }
   return pref;
 }
 nsSize
 nsListBoxLayout::GetMinSize(nsIFrame* aBox, nsBoxLayoutState& aBoxLayoutState)
 {
   nsSize minSize = nsGridRowGroupLayout::GetMinSize(aBox, aBoxLayoutState);
   nsListBoxBodyFrame* frame = static_cast<nsListBoxBodyFrame*>(aBox);
   if (frame) {
     nscoord rowheight = frame->GetRowHeightAppUnits();
     minSize.height = frame->GetRowCount() * rowheight;
     // Pad the height.
     nscoord y = frame->GetAvailableHeight();
     if (minSize.height > y && y > 0 && rowheight > 0) {
       nscoord m = (minSize.height-y)%rowheight;
       nscoord remainder = m == 0 ? 0 : rowheight - m;
       minSize.height += remainder;
     }
     if (nsContentUtils::HasNonEmptyAttr(frame->GetContent(), kNameSpaceID_None,
                                         nsGkAtoms::sizemode)) {
       nscoord width = frame->ComputeIntrinsicWidth(aBoxLayoutState);
       if (width > minSize.width)
         minSize.width = width;
     }
   }
   return minSize;
 }
 nsSize
 nsListBoxLayout::GetMaxSize(nsIFrame* aBox, nsBoxLayoutState& aBoxLayoutState)
 {
   nsSize maxSize = nsGridRowGroupLayout::GetMaxSize(aBox, aBoxLayoutState);
   nsListBoxBodyFrame* frame = static_cast<nsListBoxBodyFrame*>(aBox);
   if (frame) {
     nscoord rowheight = frame->GetRowHeightAppUnits();
     maxSize.height = frame->GetRowCount() * rowheight;
     // Pad the height.
     nscoord y = frame->GetAvailableHeight();
     if (maxSize.height > y && y > 0 && rowheight > 0) {
       nscoord m = (maxSize.height-y)%rowheight;
       nscoord remainder = m == 0 ? 0 : rowheight - m;
       maxSize.height += remainder;
     }
   }
   return maxSize;
 }
 NS_IMETHODIMP
 nsListBoxLayout::Layout(nsIFrame* aBox, nsBoxLayoutState& aState)
 {
   return LayoutInternal(aBox, aState);
 }
 /////////// nsListBoxLayout /////////////////////////
 /**
  * Called to layout our our children. Does no frame construction
  */
 NS_IMETHODIMP
 nsListBoxLayout::LayoutInternal(nsIFrame* aBox, nsBoxLayoutState& aState)
 {
   int32_t redrawStart = -1;
   // Get the start y position.
   nsListBoxBodyFrame* body = static_cast<nsListBoxBodyFrame*>(aBox);
   if (!body) {
     NS_ERROR("Frame encountered that isn't a listboxbody!");
     return NS_ERROR_FAILURE;
   }
   nsMargin margin;
   // Get our client rect.
   nsRect clientRect;
   aBox->GetClientRect(clientRect);
   // Get the starting y position and the remaining available
   // height.
   nscoord availableHeight = body->GetAvailableHeight();
   nscoord yOffset = body->GetYPosition();
   if (availableHeight <= 0) {
     bool fixed = (body->GetFixedRowSize() != -1);
     if (fixed)
       availableHeight = 10;
     else
       return NS_OK;
   }
   // run through all our currently created children
   nsIFrame* box = body->GetChildBox();
   // if the reason is resize or initial we must relayout.
   nscoord rowHeight = body->GetRowHeightAppUnits();
   while (box) {
     // If this box is dirty or if it has dirty children, we
     // call layout on it.
     nsRect childRect(box->GetRect());
     box->GetMargin(margin);
     // relayout if we must or we are dirty or some of our children are dirty
     //   or the client area is wider than us
     // XXXldb There should probably be a resize check here too!
     if (NS_SUBTREE_DIRTY(box) || childRect.width < clientRect.width) {
       childRect.x = 0;
       childRect.y = yOffset;
       childRect.width = clientRect.width;
       nsSize size = box->GetPrefSize(aState);
       body->SetRowHeight(size.height);
       childRect.height = rowHeight;
       childRect.Deflate(margin);
       box->SetBounds(aState, childRect);
       box->Layout(aState);
     } else {
       // if the child did not need to be relayed out. Then its easy.
       // Place the child by just grabbing its rect and adjusting the y.
       int32_t newPos = yOffset+margin.top;
       // are we pushing down or pulling up any rows?
       // Then we may have to redraw everything below the moved
       // rows.
       if (redrawStart == -1 && childRect.y != newPos)
         redrawStart = newPos;
       childRect.y = newPos;
       box->SetBounds(aState, childRect);
     }
     // Ok now the available size gets smaller and we move the
     // starting position of the next child down some.
     nscoord size = childRect.height + margin.top + margin.bottom;
     yOffset += size;
     availableHeight -= size;
     box = box->GetNextBox();
   }
   // We have enough available height left to add some more rows
   // Since we can't do this during layout, we post a callback
   // that will be processed after the reflow completes.
   body->PostReflowCallback();
   // if rows were pushed down or pulled up because some rows were added
   // before them then redraw everything under the inserted rows. The inserted
   // rows will automatically be redrawn because the were marked dirty on insertion.
   if (redrawStart > -1) {
     aBox->Redraw(aState);
   }
   return NS_OK;
 }
 // Creation Routines ///////////////////////////////////////////////////////////////////////
 already_AddRefed<nsBoxLayout> NS_NewListBoxLayout()
 {
   nsRefPtr<nsBoxLayout> layout = new nsListBoxLayout();
   return layout.forget();
 }

The Tor Browser / annotate

layout/xul/nsListBoxLayout.cpp@925c144e1f1f (annotated)

layout/xul/nsListBoxLayout.cpp