/* -*- 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 "mozilla/dom/NameSpaceConstants.h" #include "nsGkAtoms.h" #include "nsContentUtils.h" nsListBoxLayout::nsListBoxLayout() : nsGridRowGroupLayout() { } ////////// nsBoxLayout ////////////// nsSize nsListBoxLayout::GetXULPrefSize(nsIFrame* aBox, nsBoxLayoutState& aBoxLayoutState) { nsSize pref = nsGridRowGroupLayout::GetXULPrefSize(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->ComputeIntrinsicISize(aBoxLayoutState); if (width > pref.width) pref.width = width; } } return pref; } nsSize nsListBoxLayout::GetXULMinSize(nsIFrame* aBox, nsBoxLayoutState& aBoxLayoutState) { nsSize minSize = nsGridRowGroupLayout::GetXULMinSize(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->ComputeIntrinsicISize(aBoxLayoutState); if (width > minSize.width) minSize.width = width; } } return minSize; } nsSize nsListBoxLayout::GetXULMaxSize(nsIFrame* aBox, nsBoxLayoutState& aBoxLayoutState) { nsSize maxSize = nsGridRowGroupLayout::GetXULMaxSize(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::XULLayout(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->GetXULClientRect(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 = nsBox::GetChildXULBox(body); // 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->GetXULMargin(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->GetXULPrefSize(aState); body->SetRowHeight(size.height); childRect.height = rowHeight; childRect.Deflate(margin); box->SetXULBounds(aState, childRect); box->XULLayout(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->SetXULBounds(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 = nsBox::GetNextXULBox(box); } // 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->XULRedraw(aState); } return NS_OK; } // Creation Routines /////////////////////////////////////////////////////////////////////// already_AddRefed<nsBoxLayout> NS_NewListBoxLayout() { RefPtr<nsBoxLayout> layout = new nsListBoxLayout(); return layout.forget(); }