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