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Optimize column preferred width calculation a bit.

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Move calculating the width of the column title itself out to
OutlineView::GetColumnPreferredWidth(). Previously, each pass would
compute the width of both the field itself and the column title,
leading to considerable redundant work. Also, take outline level indent
into account in the resulting width. Should improve performance a bit.
This commit is contained in:
Rene Gollent 2012-11-06 16:29:19 +01:00
parent 9b64b5d241
commit 7bcbf187d0
2 changed files with 13 additions and 14 deletions
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17
src/kits/interface/ColumnListView.cpp
View File

@ -62,6 +62,7 @@ All rights reserved.
#include <Region.h>
#include <ScrollBar.h>
#include <String.h>
#include <SupportDefs.h>
#include <Window.h>
#include <ObjectListPrivate.h>
@ -4783,16 +4784,20 @@ float
OutlineView::GetColumnPreferredWidth(BColumn* column)
{
float preferred = 0.0;
for (RecursiveOutlineIterator iterator(&fRows); iterator.CurrentRow();
iterator.GoToNext()) {
BRow* row = iterator.CurrentRow();
for (RecursiveOutlineIterator iterator(&fRows); BRow* row =
iterator.CurrentRow(); iterator.GoToNext()) {
BField* field = row->GetField(column->fFieldID);
if (field) {
float width = column->GetPreferredWidth(field, this);
if (preferred < width)
preferred = width;
float width = column->GetPreferredWidth(field, this)
+ iterator.CurrentLevel() * kOutlineLevelIndent;
preferred = max_c(preferred, width);
}
}
BString name;
column->GetColumnName(&name);
preferred = max_c(preferred, StringWidth(name));
// Constrain to preferred width. This makes the method do a little
// more than asked, but it's for convenience.
if (preferred < column->MinWidth())

10
src/kits/interface/ColumnTypes.cpp
View File

@ -106,9 +106,7 @@ BTitledColumn::FontHeight() const
float
BTitledColumn::GetPreferredWidth(BField *_field, BView* parent) const
{
BFont font;
parent->GetFont(&font);
return font.StringWidth(fTitle.String()) + 2 * kTEXT_MARGIN;
return parent->StringWidth(fTitle.String()) + 2 * kTEXT_MARGIN;
}
@ -202,11 +200,7 @@ float
BStringColumn::GetPreferredWidth(BField *_field, BView* parent) const
{
BStringField* field = static_cast<BStringField*>(_field);
BFont font;
parent->GetFont(&font);
float width = font.StringWidth(field->String()) + 2 * kTEXT_MARGIN;
float parentWidth = BTitledColumn::GetPreferredWidth(_field, parent);
return max_c(width, parentWidth);
return parent->StringWidth(field->String()) + 2 * kTEXT_MARGIN;
}