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253 lines
11 KiB
253 lines
11 KiB
# MouseKeys
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Have you ever wanted to control the mouse cursor from the comfort of your
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keyboard? With this plugin, you can. While it may not replace the mouse in all
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situations, there are plenty of cases where one will not have to lift their
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hands off the keyboard just to nudge the mouse cursor away a little.
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Of course, there are a lot more one can do with the plugin than to nudge the
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cursor! Mouse keys are provided for all four *and* diagonal movement; mouse
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buttons; and a unique warping mechanism too. And not only these: the speed of
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the cursor, the mouse wheel, and that of acceleration can all be configured to
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match one's desired behaviour.
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## Using the plugin
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To use the plugin, simply include the header in your Sketch, tell the firmware
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to use the `MouseKeys` object, and place mouse keys on your keymap. It is best
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illustrated with an example:
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```c++
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#include <Kaleidoscope.h>
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#include <Kaleidoscope-MouseKeys.h>
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// Somewhere in the keymap:
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Key_mouseUp, Key_mouseDn, Key_mouseL, Key_mouseR,
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Key_mouseBtnL, Key_mouseBtnR
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KALEIDOSCOPE_INIT_PLUGINS(MouseKeys);
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void setup() {
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Kaleidoscope.setup ();
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}
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```
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## Keys provided by the plugin
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The plugin provides a number of keys one can put on the keymap, that allow
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control of the mouse. They can be divided into a few groups:
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### Cursor movement
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The simplest set of keys are the mouse cursor movement keys. These move the
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cursor one direction or the other, with speed and acceleration factored in. When
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a mouse cursor movement key is held down, it will move `.speed` pixels each
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`.speedDelay` milliseconds without acceleration. But when `.accelSpeed` is
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non-zero (and it is not zero by default,
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see [below](#accelspeed-and-acceldelay)), the speed will increase by
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`.accelSpeed` every `.accelDelay` milliseconds. Thus, unless configured
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otherwise, holding a direction will move that way at increasing speed.
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One can hold more than one key down at the same time, and the cursor will move
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towards a direction that is the combination of the keys held. For example,
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holding the "mouse up" and "mouse right" keys together will move the cursor
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diagonally up and right.
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The cursor movement keys are as follows:
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* `Key_mouseUp`, `Key_mouseDn`, `Key_mouseL`, `Key_mouseR`: Move the cursor up,
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down, left, or right, respectively.
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* `Key_mouseUpL`, `Key_mouseUpR`, `Key_mouseDnL`, `Key_mouseDnR`: Move the
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cursor up-left, up-right, down-left, down-right, respectively.
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### Scroll wheel
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Controlling the scroll wheel is similarly simple. It does not have acceleration,
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but one can control the speed with the `.wheelSpeed` and `.wheelDelay`
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properties (see below).
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* `Key_mouseScrollUp`, `Key_mouseScrollDn`: Scroll the mouse wheel up or down,
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respectively.
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* `Key_mouseScrollL`, `Key_mouseScrollR`: Scroll the mouse wheel left or right,
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respectively.
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### Buttons
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Buttons are even simpler than movement: there is no movement speed, nor
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acceleration involved. One just presses them.
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* `Key_mouseBtnL`, `Key_mouseBtnM`, `Key_mouseBtnR`, `Key_mouseBtnP`,
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`Key_mouseBtnN`: The left, middle, right, previous, and next mouse buttons,
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respectively.
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## Warping
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Warping is one of the most interesting features of the plugin, and is a feature
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unique to Kaleidoscope, as far as we can tell. The warping keys position the
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mouse cursor within a sector of the screen on first press, and any subsequent
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taps will warp within the previously selected sector. For example, pressing the
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north-west warp key twice will first jump to the middle of the north-west
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sector of your screen, then select the north-west sector of that, and jump to
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the middle of it.
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To stop warping, use any other mouse key, or hit the "warp end" key.
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### Warp grid size
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The warp grid size determines how MouseKeys partitions the screen to select the
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next position to jump to when pressing a warp key. The plugin provides two grid
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sizes to choose from: a *2x2* grid that splits the screen into quadrants, and a
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*3x3* grid with nine cells similar to a navigation feature included with some
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speech recognition software. By default, the plugin splits the screen into the
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2x2 grid.
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To change the warp grid size, call the plugin's `setWarpGridSize()` method:
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```c++
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MouseKeys.setWarpGridSize(MOUSE_WARP_GRID_3X3);
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```
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#### 2x2 grid
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As described above, MouseKeys warps the pointer using a grid model that reflects
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locations on the screen. By default, the plugin uses a 2x2 grid. To understand
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how warping works, examine this diagram of a screen split into that 2x2 grid:
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+-----------------------|-----------------------+
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| G | tab | |
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|-----------|-----------| tab |
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| B | esc | |
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+-----------------------|-----------------------+
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| B | esc |
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+-----------------------|-----------------------+
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Each quadrant is labed with a key that, when pressed, moves the mouse pointer
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to the center of that quadrant. With this layout, pressing <kbd>G</kbd> warps
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the pointer to the top-left quadant. Then, the plugin "zooms" into that sector
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with a smaller grid so that the next warp key pressed jumps the pointer more
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precisely within the sector. In this case, if we press <kbd>esc</kbd> next,
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the pointer warps to the bottom-right corner within that quadrant.
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The warping keys for the 2x2 grid are the following:
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* `Key_mouseWarpNW`, `Key_mouseWarpNE`, `Key_mouseWarpSW`, `Key_mouseWarpSE`:
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Warp towards the north-west, north-east, south-west, or south-east quadrants,
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respectively.
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* `Key_mouseWarpEnd`: End the warping sequence, resetting it to the default
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state. Using any of the warping keys after this will start from the whole
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screen again.
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#### 3x3 grid
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A 3x3 warp grid assigns a key to each of nine sectors of the screen. The next
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diagram shows a screen with a key label that warps to each sector. As we can
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see, pressing <kbd>W</kbd> warps the pointer into the top-left sector, and
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pressing <kbd>V</kbd> warps to the bottom-right corner within that sector:
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+-----------------|-----------------|-----------------+
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| W | E | R | | |
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|-----|-----|-----| | |
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| S | D | F | E | R |
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|-----|-----|-----| | |
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| X | C | V | | |
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+-----------------|-----------------|-----------------+
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| S | D | F |
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+-----------------|-----------------|-----------------+
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| X | C | V |
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+-----------------|-----------------|-----------------+
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To use a 3x3 warp grid, we may need to remap some keys. A suggested warp key
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mapping is shown below on the left side of a keyboard with a QWERTY layout:
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W | E | R T A - End Warping (Key_mouseWarpEnd)
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---|---|--- W - Warp NW Sector (Key_mouseWarpNW)
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A S | D | F G E - Warp N Sector (Key_mouseWarpN)
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---|---|--- R - Warp NE Sector (Key_mouseWarpNE)
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X | C | V B S - Warp W Sector (Key_mouseWarpW)
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D - Warp/Zoom Center (Key_mouseWarpIn)
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F - Warp E Sector (Key_mouseWarpE)
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X - Warp SW Sector (Key_mouseWarpSW)
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C - Warp S Sector (Key_mouseWarpS)
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V - Warp SE Sector (Key_mouseWarpSE)
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T - Right Click (Key_mouseBtnR)
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G - Left Click (Key_mouseBtnL)
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B - Middle Click (Key_mouseBtnM)
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This example layout replaces the default directional mouse keys and sets the
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warp keys in a comfortable position for a warp-only configuration. Of course,
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a Kaleidoscope user may retain the directional keys and map the warp keys
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elsewhere according to his or her liking.
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A 3x3 warp grid layout contains all of the keys from the 2x2 grid layout with
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the following additions:
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* `Key_mouseWarpN`, `Key_mouseWarpE`, `Key_mouseWarpS`, `Key_mouseWarpW`:
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Warp towards the north, east, south, and west sectors, respectively.
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* `Key_mouseWarpIn`: Warp to the center sector of the grid. The plugin will
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continue to "zoom" into center of the current cell with each consecutive
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press of this key.
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## Plugin methods
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The plugin provides a `MouseKeys` object, with the following methods and
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properties available:
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### `.speed` and `.speedDelay`
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> These two control the speed of the mouse cursor, when a movement key is held.
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> The former, `.speed`, controls the amount of pixels the cursor moves, when it
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> has to move, and defaults to 1. The latter, `.speedDelay` is the amount of
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> time - in milliseconds - to wait between two movements, and defaults to 0, no
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> delay.
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### `.accelSpeed` and `.accelDelay`
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> These two properties control the speed of acceleration. The former,
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> `.accelSpeed`, controls how much the speed shall be increased at each step,
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> while the second, `.accelDelay`, controls how often (in milliseconds)
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> acceleration should be applied.
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>
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> They default to 1 pixel and 50 milliseconds, respectively.
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### `.wheelSpeed` and `.wheelDelay`
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> The last two properties supported by the plugin control the mouse wheel
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> scrolling speed. The former, `.wheelSpeed`, controls the amount of ticks the
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> wheel shall scroll, and defaults to 1. The second, `.wheelDelay`, controls the
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> delay between two scroll events, and defaults to 50 milliseconds.
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### `.setSpeedLimit`
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> This method sets the maximum speed after which acceleration stops.
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> The default is 127, and the minimum value is 16 (things will not work
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> properly below 16).
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### `.setWarpGridSize`
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> This method changes the size of the grid used for [warping](#warping). The
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> following are valid sizes: `MOUSE_WARP_GRID_2X2`, `MOUSE_WARP_GRID_3X3`
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## Further reading
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There is an [example][plugin:example] that demonstrates how to use this plugin.
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[plugin:example]: /examples/Features/MouseKeys/MouseKeys.ino
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