An apron for a shading and/or closing system of a building including guidable slats designed capable of being pushed into a perforated or closed position under the action of adapted transmission means, this apron: - including driving means at the level of the side ends (7, 8) of the slats (2; 2A, 2B) for controlling the unfolding and folding of said apron, while the transmission means are: - associated with said driving means with a relative mobility with respect to the latter, in the unfolded position of the apron, in order to control, as the case may be, the opening or closing of the guidable slats; - designed capable of performing, for the control to open in the perforated position of the guidable slats, a first stroke for the control to unlock the blocking means of said slats in the closed position, followed by a stroke for controlling the opening and, conversely, for the control to close the guidable slats, a first stroke for pushing the latter towards the plane of the apron, followed by a stroke for controlling the locking of said blocking means; - wherein: - the transmission means intervene on at least one of the side ends (7, 8) of a guidable slat and comprise a strip, a band, a strap, a rod, a chain or the like on which is rotationally mounted one end of a connecting rod including an opposite end made integral in a hinging way with a guidable slat (, this connecting rod with its hinging point on the band or the like and that on the guidable slat, on the one hand, and this guidable slat with its hinging point forming a toggle joint, which through bending leads to push said guidable slat into a perforated position; - the blocking means are designed in the form of a latch including at least one bolt and at least one keeper, one associated with the connecting rod, the other one made integral in translation with the driving means. - including driving means at the level of the side ends (7, 8) of the slats (2; 2A, 2B) for controlling the unfolding and folding of said apron, while the transmission means are: - associated with said driving means with a relative mobility with respect to the latter, in the unfolded position of the apron, in order to control, as the case may be, the opening or closing of the guidable slats; - designed capable of performing, for the control to open in the perforated position of the guidable slats, a first stroke for the control to unlock the blocking means of said slats in the closed position, followed by a stroke for controlling the opening and, conversely, for the control to close the guidable slats, a first stroke for pushing the latter towards the plane of the apron, followed by a stroke for controlling the locking of said blocking means; - wherein: - the transmission means intervene on at least one of the side ends (7, 8) of a guidable slat and comprise a strip, a band, a strap, a rod, a chain or the like on which is rotationally mounted one end of a connecting rod including an opposite end made integral in a hinging way with a guidable slat (, this connecting rod with its hinging point on the band or the like and that on the guidable slat, on the one hand, and this guidable slat with its hinging point forming a toggle joint, which through bending leads to push said guidable slat into a perforated position; - the blocking means are designed in the form of a latch including at least one bolt and at least one keeper, one associated with the connecting rod, the other one made integral in translation with the driving means. - the transmission means intervene on at least one of the side ends (7, 8) of a guidable slat and comprise a strip, a band, a strap, a rod, a chain or the like on which is rotationally mounted one end of a connecting rod including an opposite end made integral in a hinging way with a guidable slat (, this connecting rod with its hinging point on the band or the like and that on the guidable slat, on the one hand, and this guidable slat with its hinging point forming a toggle joint, which through bending leads to push said guidable slat into a perforated position; - the blocking means are designed in the form of a latch including at least one bolt and at least one keeper, one associated with the connecting rod, the other one made integral in translation with the driving means.