empty_layout.cpp
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#include "empty_layout.h"
#include "matrix_layout.h"
#include <poincare/expression_layout_cursor.h>
#include <escher/palette.h>
#include <assert.h>
namespace Poincare {
EmptyLayout::EmptyLayout(Color color, bool visible, KDText::FontSize size, bool margins) :
StaticLayoutHierarchy(),
m_isVisible(visible),
m_color(color),
m_size(size),
m_margins(margins)
{
}
ExpressionLayout * EmptyLayout::clone() const {
EmptyLayout * layout = new EmptyLayout(m_color, m_isVisible, m_size, m_margins);
return layout;
}
void EmptyLayout::deleteBeforeCursor(ExpressionLayoutCursor * cursor) {
cursor->setPosition(ExpressionLayoutCursor::Position::Left);
if (m_parent) {
return m_parent->deleteBeforeCursor(cursor);
}
}
ExpressionLayoutCursor EmptyLayout::cursorLeftOf(ExpressionLayoutCursor cursor, bool * shouldRecomputeLayout) {
assert(cursor.pointedExpressionLayout() == this);
// Ask the parent.
if (m_parent) {
cursor.setPosition(ExpressionLayoutCursor::Position::Left);
return m_parent->cursorLeftOf(cursor, shouldRecomputeLayout);
}
return ExpressionLayoutCursor();
}
ExpressionLayoutCursor EmptyLayout::cursorRightOf(ExpressionLayoutCursor cursor, bool * shouldRecomputeLayout) {
assert(cursor.pointedExpressionLayout() == this);
// Ask the parent.
if (m_parent) {
cursor.setPosition(ExpressionLayoutCursor::Position::Right);
return m_parent->cursorRightOf(cursor, shouldRecomputeLayout);
}
return ExpressionLayoutCursor();
}
int EmptyLayout::writeTextInBuffer(char * buffer, int bufferSize) const {
if (bufferSize == 0) {
return -1;
}
buffer[0] = 0;
return 0;
}
void EmptyLayout::render(KDContext * ctx, KDPoint p, KDColor expressionColor, KDColor backgroundColor) {
if (m_isVisible) {
KDColor fillColor = m_color == Color::Yellow ? Palette::YellowDark : Palette::GreyBright;
ctx->fillRect(KDRect(p.x()+(m_margins ? k_marginWidth : 0), p.y()+(m_margins ? k_marginHeight : 0), width(), height()), fillColor);
ctx->fillRect(KDRect(p.x()+(m_margins ? k_marginWidth : 0), p.y()+(m_margins ? k_marginHeight : 0), width(), height()), fillColor);
}
}
KDSize EmptyLayout::computeSize() {
KDCoordinate sizeWidth = m_isVisible ? width() + 2*(m_margins ? k_marginWidth : 0) : 0;
return KDSize(sizeWidth, height() + 2*(m_margins ? k_marginHeight : 0));
}
void EmptyLayout::computeBaseline() {
m_baseline = (m_margins ? k_marginHeight : 0) + height()/2;
m_baselined = true;
}
void EmptyLayout::privateAddSibling(ExpressionLayoutCursor * cursor, ExpressionLayout * sibling, bool moveCursor) {
Color currentColor = m_color;
int indexInParent = m_parent->indexOfChild(this);
ExpressionLayout * parent = m_parent;
if (sibling->mustHaveLeftSibling()) {
m_color = Color::Yellow;
ExpressionLayout::privateAddSibling(cursor, sibling, moveCursor);
} else {
if (moveCursor) {
replaceWithAndMoveCursor(sibling, true, cursor);
} else {
replaceWith(sibling, true);
}
}
if (currentColor == Color::Grey) {
// The parent is a MatrixLayout.
static_cast<MatrixLayout *>(parent)->newRowOrColumnAtIndex(indexInParent);
}
}
ExpressionLayoutCursor EmptyLayout::cursorVerticalOf(VerticalDirection direction, ExpressionLayoutCursor cursor, bool * shouldRecomputeLayout, bool equivalentPositionVisited) {
/* The two cursor positions around an EmptyLayout are equivalent, so both
* should be checked. */
assert(cursor.pointedExpressionLayout() == this);
ExpressionLayoutCursor cursorResult = ExpressionLayout::cursorVerticalOf(direction, cursor, shouldRecomputeLayout, equivalentPositionVisited);
if (cursorResult.isDefined()) {
return cursorResult;
}
ExpressionLayoutCursor::Position newPosition = cursor.position() == ExpressionLayoutCursor::Position::Left ? ExpressionLayoutCursor::Position::Right : ExpressionLayoutCursor::Position::Left;
cursor.setPosition(newPosition);
return ExpressionLayout::cursorVerticalOf(direction, cursor, shouldRecomputeLayout, false);
}
}