MacOS – Keyboard shortcut to scroll window up and down

There really isn't a neat way of doing this. I normally hit Command + down arrow. This will bring me to the end of the page, where I can then press enter a few times, or if using textmate, you can create a snippet to insert carriage returns for you. With an application like textexpander you can program a keypress to add carriage returns for you.

Xcode

Assign some key combinations to the Scroll Line Up and Scroll Line Down actions:

Then install KeyRemap4MacBook and save a file like this as ~/Library/Application Support/KeyRemap4MacBook/private.xml:

<?xml version="1.0"?>
<root>
  <appdef>
    <appname>XCODE</appname>
    <equal>com.apple.dt.Xcode</equal>
  </appdef>
  <item>
    <name>xcodearrows</name>
    <identifier>xcodearrows</identifier>
    <only>XCODE</only>
    <autogen>__KeyToKey__ KeyCode::CURSOR_UP, VK_OPTION | ModifierFlag::NONE, KeyCode::CURSOR_UP, KeyCode::PAGEUP, ModifierFlag::CONTROL_L | ModifierFlag::OPTION_L</autogen>
    <autogen>__KeyToKey__ KeyCode::CURSOR_DOWN, VK_OPTION | ModifierFlag::NONE, KeyCode::CURSOR_DOWN, KeyCode::PAGEDOWN, ModifierFlag::CONTROL_L | ModifierFlag::OPTION_L</autogen>
  </item>
</root>

Then open the KeyRemap4MacBook application, press the ReloadXML button, and enable the setting.

Other applications

Create ~/Library/KeyBindings/ and save a property list like this like this as ~/Library/KeyBindings/DefaultKeyBinding.dict:

{
  "~\UF700" = (moveUp:, scrollLineUp:); // option-up
  "~\UF701" = (moveDown:, scrollLineDown:); // option-down
}

Then quit and reopen applications to apply the changes.

DefaultKeyBinding.dict stopped working in Xcode 4. See https://stackoverflow.com/questions/5626788/custom-key-bindings-xcode-4.

This would make option-up and option-down scroll eight lines and center the view around the caret:

{
  "~\UF700" = (moveUp:, moveUp:, moveUp:, moveUp:, moveUp:, moveUp:, moveUp, moveUp, centerSelectionInVisibleArea:);
  "~\UF701" = (moveDown:, moveDown:, moveDown:, moveDown:, moveDown:, moveDown:, moveDown, moveDown, centerSelectionInVisibleArea:);
  "~$\UF700" = (moveUpAndModifySelection:, moveUpAndModifySelection:, moveUpAndModifySelection:, moveUpAndModifySelection:, moveUpAndModifySelection:, moveUpAndModifySelection:, moveUpAndModifySelection, moveUpAndModifySelection);
  "~$\UF701" = (moveDownAndModifySelection:, moveDownAndModifySelection:, moveDownAndModifySelection:, moveDownAndModifySelection:, moveDownAndModifySelection:, moveDownAndModifySelection:, moveDownAndModifySelection, moveDownAndModifySelection);
}