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moving mouse cursor

This commit is contained in:
Daniel Samson 2026-07-17 10:48:23 +01:00
parent 626e3c5e9b
commit 9989ebbec7
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GPG Key ID: A9EB2589C60F7268
1 changed files with 28 additions and 2 deletions
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30
system/services/display-demo/display-demo.zig
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@ -9,6 +9,7 @@ const runtime = @import("runtime");
const display = runtime.display;
const system = runtime.system;
const time = runtime.time;
const input = runtime.input;
pub fn main() void {
const mode = display.info() orelse {
@ -27,8 +28,13 @@ pub fn main() void {
const box = display.createLayer(0, box_y, box_w, box_h, 1) orelse return createFailed();
_ = box.fill(0, 0, box_w, box_h, display.color(0xE0, 0x60, 0x40));
// A little cursor on top.
const cursor = display.createLayer(40, 40, 12, 12, 2) orelse return createFailed();
// A little cursor on top. Its position is signed (the layer API is i32) and clamped to
// the screen; mouse motion arrives as relative deltas we accumulate below.
var cursor_x: i32 = @intCast(mode.width / 2);
var cursor_y: i32 = @intCast(mode.height / 2);
const cursor_max_x: i32 = @as(i32, @intCast(mode.width)) - 12;
const cursor_max_y: i32 = @as(i32, @intCast(mode.height)) - 12;
const cursor = display.createLayer(cursor_x, cursor_y, 12, 12, 2) orelse return createFailed();
_ = cursor.fill(0, 0, 12, 12, display.color(0xF0, 0xF0, 0xF0));
_ = display.present();
@ -38,7 +44,20 @@ pub fn main() void {
var x: i32 = 0;
var dx: i32 = 8;
var frame: u32 = 0;
var mouse = input.subscribeMouse(); // type: ?input.MouseSubscriber
if (mouse == null) _ = system.write("display-demo: no mouse; animating without it\n");
while (true) : (frame += 1) {
if (mouse) |*ms| {
if (ms.next()) |event| {
cursor_x = clamp(cursor_x + event.dx, 0, cursor_max_x);
cursor_y = clamp(cursor_y + event.dy, 0, cursor_max_y);
_ = cursor.configure(cursor_x, cursor_y, 2, true);
}
}
x += dx;
if (x <= 0) {
x = 0;
@ -56,6 +75,13 @@ pub fn main() void {
}
}
/// Clamp `v` to the inclusive range [lo, hi].
fn clamp(v: i32, lo: i32, hi: i32) i32 {
if (v < lo) return lo;
if (v > hi) return hi;
return v;
}
fn createFailed() void {
_ = system.write("display-demo: create failed\n");
}