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verify if m_expressionContainer is set when scrolling left or right

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This commit is contained in:
Rudy Huyn 2019-04-16 18:17:22 -07:00
commit 707d51e999
1 changed files with 2 additions and 2 deletions
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4
src/Calculator/Controls/OverflowTextBlock.cpp
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@ -107,7 +107,7 @@ void OverflowTextBlock::UpdateVisualState()
void OverflowTextBlock::ScrollLeft()
{
if (m_expressionContainer->HorizontalOffset > 0)
if (m_expressionContainer != nullptr && m_expressionContainer->HorizontalOffset > 0)
{
m_scrollingLeft = true;
double offset = m_expressionContainer->HorizontalOffset - (scrollRatio * m_expressionContainer->ViewportWidth);
@ -119,7 +119,7 @@ void OverflowTextBlock::ScrollLeft()
void OverflowTextBlock::ScrollRight()
{
if (m_expressionContainer->HorizontalOffset < m_expressionContainer->ExtentWidth - m_expressionContainer->ViewportWidth)
if (m_expressionContainer != nullptr && m_expressionContainer->HorizontalOffset < m_expressionContainer->ExtentWidth - m_expressionContainer->ViewportWidth)
{
m_scrollingRight = true;
double offset = m_expressionContainer->HorizontalOffset + (scrollRatio * m_expressionContainer->ViewportWidth);