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<h1><a href="../Features/index.html">Features</a> <svg class="Page__header--separator" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 477.175 477.175"><path d="M360.73 229.075l-225.1-225.1c-5.3-5.3-13.8-5.3-19.1 0s-5.3 13.8 0 19.1l215.5 215.5-215.5 215.5c-5.3 5.3-5.3 13.8 0 19.1 2.6 2.6 6.1 4 9.5 4 3.4 0 6.9-1.3 9.5-4l225.1-225.1c5.3-5.2 5.3-13.8.1-19z"/></svg> <a href="../Features/Pointing_Device.html">Pointing Device</a></h1>
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<p><a href="#page_Pointing-Device">Pointing Device</a></p>
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</li>
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</ul>
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<h2 id="page_Pointing-Device">Pointing Device</h2>
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<p>Pointing Device is a generic name for a feature intended to be generic: moving the system pointer around. There are certainly other options for it - like mousekeys - but this aims to be easily modifiable and lightweight. You can implement custom keys to control functionality, or you can gather information from other peripherals and insert it directly here - let QMK handle the processing for you.</p>
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<p>To enable Pointing Device, uncomment the following line in your rules.mk:</p>
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<pre><code>POINTING_DEVICE_ENABLE = yes
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</code></pre>
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<p>To manipulate the mouse report, you can use the following functions:</p>
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<ul>
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<li>
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<code>pointing_device_get_report()</code> - Returns the current report_mouse_t that represents the information sent to the host computer</li>
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<li>
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<code>pointing_device_set_report(report_mouse_t newMouseReport)</code> - Overrides and saves the report_mouse_t to be sent to the host computer</li>
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</ul>
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<p>Keep in mind that a report_mouse_t (here "mouseReport") has the following properties:</p>
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<ul>
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<li>
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<code>mouseReport.x</code> - this is a signed int from -127 to 127 (not 128, this is defined in USB HID spec) representing movement (+ to the right, - to the left) on the x axis.</li>
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<li>
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<code>mouseReport.y</code> - this is a signed int from -127 to 127 (not 128, this is defined in USB HID spec) representing movement (+ upward, - downward) on the y axis.</li>
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<li>
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<code>mouseReport.v</code> - this is a signed int from -127 to 127 (not 128, this is defined in USB HID spec) representing vertical scrolling (+ upward, - downward).</li>
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<li>
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<code>mouseReport.h</code> - this is a signed int from -127 to 127 (not 128, this is defined in USB HID spec) representing horizontal scrolling (+ right, - left).</li>
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<li>
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<code>mouseReport.buttons</code> - this is a uint8_t in which the last 5 bits are used. These bits represent the mouse button state - bit 3 is mouse button 5, and bit 7 is mouse button 1.</li>
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</ul>
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<p>When the mouse report is sent, the x, y, v, and h values are set to 0 (this is done in "pointing_device_send()", which can be overridden to avoid this behavior). This way, button states persist, but movement will only occur once. For further customization, both <code>pointing_device_init</code> and <code>pointing_device_task</code> can be overridden.</p>
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<p>In the following example, a custom key is used to click the mouse and scroll 127 units vertically and horizontally, then undo all of that when released - because that's a totally useful function. Listen, this is an example:</p>
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<pre><code>case MS_SPECIAL:
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report_mouse_t currentReport = pointing_device_get_report();
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if (record->event.pressed)
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{
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currentReport.v = 127;
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currentReport.h = 127;
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currentReport.buttons |= MOUSE_BTN1; //this is defined in report.h
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}
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else
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{
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currentReport.v = -127;
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currentReport.h = -127;
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currentReport.buttons &= ~MOUSE_BTN1;
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}
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pointing_device_set_report(currentReport);
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break;
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</code></pre>
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<p>Recall that the mouse report is set to zero (except the buttons) whenever it is sent, so the scrolling would only occur once in each case.</p>
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