first commit

libraries/lvgl/examples/widgets/btn/lv_example_btn_3.py

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+#
+# Create a style transition on a button to act like a gum when clicked
+#
+
+# Properties to transition
+props = [lv.STYLE.TRANSFORM_WIDTH, lv.STYLE.TRANSFORM_HEIGHT, lv.STYLE.TEXT_LETTER_SPACE, 0]
+
+# Transition descriptor when going back to the default state.
+# Add some delay to be sure the press transition is visible even if the press was very short*/
+transition_dsc_def = lv.style_transition_dsc_t()
+transition_dsc_def.init(props, lv.anim_t.path_overshoot, 250, 100, None)
+
+# Transition descriptor when going to pressed state.
+# No delay, go to pressed state immediately
+transition_dsc_pr = lv.style_transition_dsc_t()
+transition_dsc_pr.init(props, lv.anim_t.path_ease_in_out, 250, 0, None)
+
+# Add only the new transition to the default state
+style_def = lv.style_t()
+style_def.init()
+style_def.set_transition(transition_dsc_def)
+
+# Add the transition and some transformation to the presses state.
+style_pr = lv.style_t()
+style_pr.init()
+style_pr.set_transform_width(10)
+style_pr.set_transform_height(-10)
+style_pr.set_text_letter_space(10)
+style_pr.set_transition(transition_dsc_pr)
+
+btn1 = lv.btn(lv.scr_act())
+btn1.align(lv.ALIGN.CENTER, 0, -80)
+btn1.add_style(style_pr, lv.STATE.PRESSED)
+btn1.add_style(style_def, 0)
+
+label = lv.label(btn1)
+label.set_text("Gum")
+