1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/layout/xul/nsListBoxLayout.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,212 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#include "nsListBoxLayout.h"
1.10 +
1.11 +#include "nsListBoxBodyFrame.h"
1.12 +#include "nsBox.h"
1.13 +#include "nsBoxLayoutState.h"
1.14 +#include "nsIScrollableFrame.h"
1.15 +#include "nsIReflowCallback.h"
1.16 +#include "nsNameSpaceManager.h"
1.17 +#include "nsGkAtoms.h"
1.18 +#include "nsContentUtils.h"
1.19 +
1.20 +nsListBoxLayout::nsListBoxLayout() : nsGridRowGroupLayout()
1.21 +{
1.22 +}
1.23 +
1.24 +////////// nsBoxLayout //////////////
1.25 +
1.26 +nsSize
1.27 +nsListBoxLayout::GetPrefSize(nsIFrame* aBox, nsBoxLayoutState& aBoxLayoutState)
1.28 +{
1.29 + nsSize pref = nsGridRowGroupLayout::GetPrefSize(aBox, aBoxLayoutState);
1.30 +
1.31 + nsListBoxBodyFrame* frame = static_cast<nsListBoxBodyFrame*>(aBox);
1.32 + if (frame) {
1.33 + nscoord rowheight = frame->GetRowHeightAppUnits();
1.34 + pref.height = frame->GetRowCount() * rowheight;
1.35 + // Pad the height.
1.36 + nscoord y = frame->GetAvailableHeight();
1.37 + if (pref.height > y && y > 0 && rowheight > 0) {
1.38 + nscoord m = (pref.height-y)%rowheight;
1.39 + nscoord remainder = m == 0 ? 0 : rowheight - m;
1.40 + pref.height += remainder;
1.41 + }
1.42 + if (nsContentUtils::HasNonEmptyAttr(frame->GetContent(), kNameSpaceID_None,
1.43 + nsGkAtoms::sizemode)) {
1.44 + nscoord width = frame->ComputeIntrinsicWidth(aBoxLayoutState);
1.45 + if (width > pref.width)
1.46 + pref.width = width;
1.47 + }
1.48 + }
1.49 + return pref;
1.50 +}
1.51 +
1.52 +nsSize
1.53 +nsListBoxLayout::GetMinSize(nsIFrame* aBox, nsBoxLayoutState& aBoxLayoutState)
1.54 +{
1.55 + nsSize minSize = nsGridRowGroupLayout::GetMinSize(aBox, aBoxLayoutState);
1.56 +
1.57 + nsListBoxBodyFrame* frame = static_cast<nsListBoxBodyFrame*>(aBox);
1.58 + if (frame) {
1.59 + nscoord rowheight = frame->GetRowHeightAppUnits();
1.60 + minSize.height = frame->GetRowCount() * rowheight;
1.61 + // Pad the height.
1.62 + nscoord y = frame->GetAvailableHeight();
1.63 + if (minSize.height > y && y > 0 && rowheight > 0) {
1.64 + nscoord m = (minSize.height-y)%rowheight;
1.65 + nscoord remainder = m == 0 ? 0 : rowheight - m;
1.66 + minSize.height += remainder;
1.67 + }
1.68 + if (nsContentUtils::HasNonEmptyAttr(frame->GetContent(), kNameSpaceID_None,
1.69 + nsGkAtoms::sizemode)) {
1.70 + nscoord width = frame->ComputeIntrinsicWidth(aBoxLayoutState);
1.71 + if (width > minSize.width)
1.72 + minSize.width = width;
1.73 + }
1.74 + }
1.75 + return minSize;
1.76 +}
1.77 +
1.78 +nsSize
1.79 +nsListBoxLayout::GetMaxSize(nsIFrame* aBox, nsBoxLayoutState& aBoxLayoutState)
1.80 +{
1.81 + nsSize maxSize = nsGridRowGroupLayout::GetMaxSize(aBox, aBoxLayoutState);
1.82 +
1.83 + nsListBoxBodyFrame* frame = static_cast<nsListBoxBodyFrame*>(aBox);
1.84 + if (frame) {
1.85 + nscoord rowheight = frame->GetRowHeightAppUnits();
1.86 + maxSize.height = frame->GetRowCount() * rowheight;
1.87 + // Pad the height.
1.88 + nscoord y = frame->GetAvailableHeight();
1.89 + if (maxSize.height > y && y > 0 && rowheight > 0) {
1.90 + nscoord m = (maxSize.height-y)%rowheight;
1.91 + nscoord remainder = m == 0 ? 0 : rowheight - m;
1.92 + maxSize.height += remainder;
1.93 + }
1.94 + }
1.95 + return maxSize;
1.96 +}
1.97 +
1.98 +NS_IMETHODIMP
1.99 +nsListBoxLayout::Layout(nsIFrame* aBox, nsBoxLayoutState& aState)
1.100 +{
1.101 + return LayoutInternal(aBox, aState);
1.102 +}
1.103 +
1.104 +
1.105 +/////////// nsListBoxLayout /////////////////////////
1.106 +
1.107 +/**
1.108 + * Called to layout our our children. Does no frame construction
1.109 + */
1.110 +NS_IMETHODIMP
1.111 +nsListBoxLayout::LayoutInternal(nsIFrame* aBox, nsBoxLayoutState& aState)
1.112 +{
1.113 + int32_t redrawStart = -1;
1.114 +
1.115 + // Get the start y position.
1.116 + nsListBoxBodyFrame* body = static_cast<nsListBoxBodyFrame*>(aBox);
1.117 + if (!body) {
1.118 + NS_ERROR("Frame encountered that isn't a listboxbody!");
1.119 + return NS_ERROR_FAILURE;
1.120 + }
1.121 +
1.122 + nsMargin margin;
1.123 +
1.124 + // Get our client rect.
1.125 + nsRect clientRect;
1.126 + aBox->GetClientRect(clientRect);
1.127 +
1.128 + // Get the starting y position and the remaining available
1.129 + // height.
1.130 + nscoord availableHeight = body->GetAvailableHeight();
1.131 + nscoord yOffset = body->GetYPosition();
1.132 +
1.133 + if (availableHeight <= 0) {
1.134 + bool fixed = (body->GetFixedRowSize() != -1);
1.135 + if (fixed)
1.136 + availableHeight = 10;
1.137 + else
1.138 + return NS_OK;
1.139 + }
1.140 +
1.141 + // run through all our currently created children
1.142 + nsIFrame* box = body->GetChildBox();
1.143 +
1.144 + // if the reason is resize or initial we must relayout.
1.145 + nscoord rowHeight = body->GetRowHeightAppUnits();
1.146 +
1.147 + while (box) {
1.148 + // If this box is dirty or if it has dirty children, we
1.149 + // call layout on it.
1.150 + nsRect childRect(box->GetRect());
1.151 + box->GetMargin(margin);
1.152 +
1.153 + // relayout if we must or we are dirty or some of our children are dirty
1.154 + // or the client area is wider than us
1.155 + // XXXldb There should probably be a resize check here too!
1.156 + if (NS_SUBTREE_DIRTY(box) || childRect.width < clientRect.width) {
1.157 + childRect.x = 0;
1.158 + childRect.y = yOffset;
1.159 + childRect.width = clientRect.width;
1.160 +
1.161 + nsSize size = box->GetPrefSize(aState);
1.162 + body->SetRowHeight(size.height);
1.163 +
1.164 + childRect.height = rowHeight;
1.165 +
1.166 + childRect.Deflate(margin);
1.167 + box->SetBounds(aState, childRect);
1.168 + box->Layout(aState);
1.169 + } else {
1.170 + // if the child did not need to be relayed out. Then its easy.
1.171 + // Place the child by just grabbing its rect and adjusting the y.
1.172 + int32_t newPos = yOffset+margin.top;
1.173 +
1.174 + // are we pushing down or pulling up any rows?
1.175 + // Then we may have to redraw everything below the moved
1.176 + // rows.
1.177 + if (redrawStart == -1 && childRect.y != newPos)
1.178 + redrawStart = newPos;
1.179 +
1.180 + childRect.y = newPos;
1.181 + box->SetBounds(aState, childRect);
1.182 + }
1.183 +
1.184 + // Ok now the available size gets smaller and we move the
1.185 + // starting position of the next child down some.
1.186 + nscoord size = childRect.height + margin.top + margin.bottom;
1.187 +
1.188 + yOffset += size;
1.189 + availableHeight -= size;
1.190 +
1.191 + box = box->GetNextBox();
1.192 + }
1.193 +
1.194 + // We have enough available height left to add some more rows
1.195 + // Since we can't do this during layout, we post a callback
1.196 + // that will be processed after the reflow completes.
1.197 + body->PostReflowCallback();
1.198 +
1.199 + // if rows were pushed down or pulled up because some rows were added
1.200 + // before them then redraw everything under the inserted rows. The inserted
1.201 + // rows will automatically be redrawn because the were marked dirty on insertion.
1.202 + if (redrawStart > -1) {
1.203 + aBox->Redraw(aState);
1.204 + }
1.205 +
1.206 + return NS_OK;
1.207 +}
1.208 +
1.209 +// Creation Routines ///////////////////////////////////////////////////////////////////////
1.210 +
1.211 +already_AddRefed<nsBoxLayout> NS_NewListBoxLayout()
1.212 +{
1.213 + nsRefPtr<nsBoxLayout> layout = new nsListBoxLayout();
1.214 + return layout.forget();
1.215 +}
