imgui_mouse_capture.py

# Detect ImGui mouse capture

import harfang as hg

hg.InputInit()
hg.WindowSystemInit()

res_x, res_y = 1280, 720
win = hg.RenderInit('Harfang - ImGui Mouse Capture', res_x, res_y, hg.RF_VSync)

hg.AddAssetsFolder('resources_compiled')

#
hg.ImGuiInit(10, hg.LoadProgramFromAssets('core/shader/imgui'), hg.LoadProgramFromAssets('core/shader/imgui_image'))
text_value = 'Clicking into this field will not clear the screen in red.'

#
mouse = hg.Mouse()
keyboard = hg.Keyboard()

while not hg.ReadKeyboard().Key(hg.K_Escape) and hg.IsWindowOpen(win):
	render_was_reset, res_x, res_y = hg.RenderResetToWindow(win, res_x, res_y, hg.RF_VSync)
	mouse.Update()
	keyboard.Update()

	dt = hg.TickClock()
	hg.ImGuiBeginFrame(res_x, res_y, dt, mouse.GetState(), keyboard.GetState())

	if hg.ImGuiWantCaptureMouse():
		clear_color = hg.Color.Black  # black background if ImGui has mouse capture
	else:
		clear_color = hg.Color.Red if mouse.Down(hg.MB_0) else hg.Color.Black

	hg.SetView2D(0, 0, 0, res_x, res_y, -1, 0, hg.CF_Color | hg.CF_Depth, clear_color, 1, 0)

	hg.ImGuiSetNextWindowPosCenter(hg.ImGuiCond_Once)
	hg.ImGuiSetNextWindowSize(hg.Vec2(700, 96), hg.ImGuiCond_Once)

	if hg.ImGuiBegin('Detecting ImGui mouse capture'):
		hg.ImGuiTextWrapped('Click outside of the GUI to clear the screen in red.')
		hg.ImGuiSeparator()
		_, text_value = hg.ImGuiInputText('Text Input', text_value, 4096)
	hg.ImGuiEnd()

	hg.ImGuiEndFrame(0)

	hg.Frame()
	hg.UpdateWindow(win)

hg.DestroyWindow(win)