Intellij IDEA, control page up, page down scroll size

Question

I am not satisfied with the scrolling behaviour in intellij for page up, page down. It doesn't feel right. It always feels as if I get out of the scope.

Is it possible to adjust the scroll size of page up, page down? Perhaps to half a page or similar.

Answer 1

I had taken @yole's answer and implemented all of the actions he had described in a separate plugin:

There is no way to control this through the settings. What you can do is write a plugin that performs scrolling in the way that you prefer. It's fairly easy: all you need to do is copy the existing PageUpAction/PageDownAction classes and the methods they call (EditorActionUtil.moveCaretPageUp/Down) to scroll by as much as you want.

This plugin implements new actions "Partial Page Up" and "Partial Page Down" which allow one to scroll a configurable size of screen definable in the usual IDEA settings dialog.

There's an installable version of the plugin in official JetBrains repository.

Answer 2

There is no way to control this through the settings. What you can do is write a plugin that performs scrolling in the way that you prefer. It's fairly easy: all you need to do is copy the existing PageUpAction/PageDownAction classes and the methods they call (EditorActionUtil.moveCaretPageUp/Down) to scroll by as much as you want.

Answer 3

Since many are inquiring about this, for mac users this can be controlled globally instead by instead scrolling on page up/down using karabiner application and adding the following complex rule:

{
    "description": "mmm.karabiner.page.up.down.to.scroll",
    "manipulators": [
        {
            "conditions": [
                {
                    "bundle_identifiers": [
                        "^net.java.openjdk.cmd",
                        "^com.jetbrains.intellij"
                    ],
                    "type": "frontmost_application_if"
                }
            ],
            "from": {
                "key_code": "page_up"
            },
            "to": [
                {
                    "mouse_key": {
                        "vertical_wheel": -51
                    }
                }
            ],
            "to_delayed_action": {
                "to_if_invoked": [
                    {
                        "pointing_button": "button1"
                    }
                ]
            },
            "type": "basic"
        },
        {
            "conditions": [
                {
                    "bundle_identifiers": [
                        "^net.java.openjdk.cmd",
                        "^com.jetbrains.intellij"
                    ],
                    "type": "frontmost_application_unless"
                }
            ],
            "from": {
                "key_code": "page_up"
            },
            "to": [
                {
                    "mouse_key": {
                        "vertical_wheel": -51
                    }
                }
            ],
            "type": "basic"
        },
        {
            "conditions": [
                {
                    "bundle_identifiers": [
                        "^net.java.openjdk.cmd",
                        "^com.jetbrains.intellij"
                    ],
                    "type": "frontmost_application_if"
                }
            ],
            "from": {
                "key_code": "up_arrow",
                "modifiers": {
                    "mandatory": [
                        "fn"
                    ]
                }
            },
            "to": [
                {
                    "mouse_key": {
                        "vertical_wheel": -51
                    }
                }
            ],
            "to_delayed_action": {
                "to_if_invoked": [
                    {
                        "pointing_button": "button1"
                    }
                ]
            },
            "type": "basic"
        },
        {
            "conditions": [
                {
                    "bundle_identifiers": [
                        "^net.java.openjdk.cmd",
                        "^com.jetbrains.intellij"
                    ],
                    "type": "frontmost_application_unless"
                }
            ],
            "from": {
                "key_code": "up_arrow",
                "modifiers": {
                    "mandatory": [
                        "fn"
                    ]
                }
            },
            "to": [
                {
                    "mouse_key": {
                        "vertical_wheel": -51
                    }
                }
            ],
            "type": "basic"
        },
        {
            "conditions": [
                {
                    "bundle_identifiers": [
                        "^net.java.openjdk.cmd",
                        "^com.jetbrains.intellij"
                    ],
                    "type": "frontmost_application_if"
                }
            ],
            "from": {
                "key_code": "page_down"
            },
            "to": [
                {
                    "mouse_key": {
                        "vertical_wheel": 51
                    }
                }
            ],
            "to_delayed_action": {
                "to_if_invoked": [
                    {
                        "pointing_button": "button1"
                    }
                ]
            },
            "type": "basic"
        },
        {
            "conditions": [
                {
                    "bundle_identifiers": [
                        "^net.java.openjdk.cmd",
                        "^com.jetbrains.intellij"
                    ],
                    "type": "frontmost_application_unless"
                }
            ],
            "from": {
                "key_code": "page_down"
            },
            "to": [
                {
                    "mouse_key": {
                        "vertical_wheel": 51
                    }
                }
            ],
            "type": "basic"
        },
        {
            "conditions": [
                {
                    "bundle_identifiers": [
                        "^net.java.openjdk.cmd",
                        "^com.jetbrains.intellij"
                    ],
                    "type": "frontmost_application_if"
                }
            ],
            "from": {
                "key_code": "down_arrow",
                "modifiers": {
                    "mandatory": [
                        "fn"
                    ]
                }
            },
            "to": [
                {
                    "mouse_key": {
                        "vertical_wheel": 51
                    }
                }
            ],
            "to_delayed_action": {
                "to_if_invoked": [
                    {
                        "pointing_button": "button1"
                    }
                ]
            },
            "type": "basic"
        },
        {
            "conditions": [
                {
                    "bundle_identifiers": [
                        "^net.java.openjdk.cmd",
                        "^com.jetbrains.intellij"
                    ],
                    "type": "frontmost_application_unless"
                }
            ],
            "from": {
                "key_code": "down_arrow",
                "modifiers": {
                    "mandatory": [
                        "fn"
                    ]
                }
            },
            "to": [
                {
                    "mouse_key": {
                        "vertical_wheel": 51
                    }
                }
            ],
            "type": "basic"
        }
    ]
},

Also do note, to get smooth scrolling, consider down loading Mos application and adjust the preferences if desired.

https://mos.caldis.me/

This might have other consequences on your Mac so you might need to have to adjust other things since your page_up/down is no longer a page_up/down but mouse scrolls instead.